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srcset=\"https:\/\/cdn.builder.io\/api\/v1\/image\/assets%2F48d1cdcd52ec4d289f1ef8c4f75da167%2Fd655d4f2e12e4e60990ad9d0f9a824b9?width=100 100w, https:\/\/cdn.builder.io\/api\/v1\/image\/assets%2F48d1cdcd52ec4d289f1ef8c4f75da167%2Fd655d4f2e12e4e60990ad9d0f9a824b9?width=200 200w, https:\/\/cdn.builder.io\/api\/v1\/image\/assets%2F48d1cdcd52ec4d289f1ef8c4f75da167%2Fd655d4f2e12e4e60990ad9d0f9a824b9?width=400 400w, https:\/\/cdn.builder.io\/api\/v1\/image\/assets%2F48d1cdcd52ec4d289f1ef8c4f75da167%2Fd655d4f2e12e4e60990ad9d0f9a824b9?width=800 800w, https:\/\/cdn.builder.io\/api\/v1\/image\/assets%2F48d1cdcd52ec4d289f1ef8c4f75da167%2Fd655d4f2e12e4e60990ad9d0f9a824b9?width=1200 1200w, https:\/\/cdn.builder.io\/api\/v1\/image\/assets%2F48d1cdcd52ec4d289f1ef8c4f75da167%2Fd655d4f2e12e4e60990ad9d0f9a824b9?width=1600 1600w, https:\/\/cdn.builder.io\/api\/v1\/image\/assets%2F48d1cdcd52ec4d289f1ef8c4f75da167%2Fd655d4f2e12e4e60990ad9d0f9a824b9?width=2000 2000w, https:\/\/cdn.builder.io\/api\/v1\/image\/assets%2F48d1cdcd52ec4d289f1ef8c4f75da167%2Fd655d4f2e12e4e60990ad9d0f9a824b9\" sizes=\"100vw\"\u003e\u003c\/picture\u003e\u003cstyle data-emotion-css=\"ew2w8k\"\u003e\u003c\/style\u003e\n\u003cdiv class=\"builder-image-sizer css-ew2w8k\"\u003e \u003c\/div\u003e\n\u003c\/div\u003e\n\u003cstyle data-emotion-css=\"hgfgng\"\u003e\u003c\/style\u003e\n\u003cdiv class=\"builder-block builder-b076054253ed4c80b7bb1bc3dcc5e2cc builder-has-component css-hgfgng\" builder-id=\"builder-b076054253ed4c80b7bb1bc3dcc5e2cc\"\u003e\n\u003cstyle data-emotion-css=\"1qggkls\"\u003e\u003c\/style\u003e\n\u003cspan class=\"builder-text css-1qggkls\"\u003e\u003cp\u003eIntroducing the newly revised Pass Labs HPA-1c. The next generation of the famous HPA-1 headphone amplifier. Since its introduction, it has been one of our most popular headphone amps at Moon Audio. Pass Labs has raised the bar by refining the already amazing circuit. One of the most overlooked sections in any design is the power supply. This is where Pass Labs focused its efforts to improve filtration and regulation to make an already quite amplifier, even quieter. The two main power supply harmonics have been reduced by a whopping 10 dB. This resulted in a 6db broadband noise reduction. RFI snubbers were also added across the rectifiers to clean up the entire ground plane of the circuit. Ground planes have become a hot topic in the Audiophile World. We are finding how important this is for systems\u003cbr\u003e\u003cbr\u003eThe HPA-1c features a single-ended quarter-inch headphone output and a large and extremely accurate volume control. The HPA-1c is capable of outputting 2 watts of power at 30ohms to drive most full-size headphones on the market. It features a Class A amplifier and outputs enough power to drive most power-hungry headphones with ease, such as the \u003ca href=\"https:\/\/www.moon-audio.pro\/hifiman-susvara-headphones.html\" rel=\"noopener noreferrer\" target=\"_blank\"\u003eHiFiMan Susvara\u003c\/a\u003e. The HPA-1c features low feedback, wide bandwidth, and a direct-coupled MOSFET output stage. These improvements now offer the ability to drive high-sensitivity IEMs without residual background hiss. Many of these updates stemmed from our collaboration with Pass Labs to help our IEM-based customers looking for a reference home IEM headphone amplifier.\u003c\/p\u003e\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"builder-block builder-4d4a4b6a94634a8b94673fe3213c2b5a builder-has-component css-hgfgng\" builder-id=\"builder-4d4a4b6a94634a8b94673fe3213c2b5a\"\u003e\u003cspan class=\"builder-text css-1qggkls\"\u003e\u003cp\u003eThe other side of the audiophile coin for the HPA-1c is that it can also function as a high-quality standalone line-level preamplifier. The preamp function can stand on its own with preamps in much higher price ranges, and represents a tremendous value for a unit of this size. You're getting a high-end, Class A headphone amplifier and preamplifier in one device. \u003cspan style=\"text-align: inherit; display: inline !important;\"\u003eThe preamp section is capable of driving a typical power amplifier load (10kΩ \u003c\/span\u003e\u003cspan style=\"color: inherit; font-family: inherit; font-size: inherit; font-weight: inherit; letter-spacing: inherit; text-align: inherit; display: inline !important;\"\u003eor higher) with very low output impedance.\u003c\/span\u003e\u003c\/p\u003e\u003c\/span\u003e\u003c\/div\u003e\n\u003cstyle data-emotion-css=\"ur9nhf\"\u003e\u003c\/style\u003e\n\u003cdiv class=\"builder-block builder-295078c1f6894929acfa0bb31827e582 css-ur9nhf\" builder-id=\"builder-295078c1f6894929acfa0bb31827e582\"\u003e\u003c\/div\u003e\n\u003cstyle data-emotion-css=\"1vsqrur\"\u003e\u003c\/style\u003e\n\u003cdiv class=\"builder-block builder-d1d59ad93de14b6db11fe806b970f7a2 builder-has-component css-1vsqrur\" builder-id=\"builder-d1d59ad93de14b6db11fe806b970f7a2\"\u003e\u003cspan class=\"builder-text css-1qggkls\"\u003e\u003cp\u003e\u003cstrong\u003eDragon Cable Recommendation:\u003c\/strong\u003e we recommend pairing the HPA-1c Headphone Amplifier with the \u003ca href=\"https:\/\/www.moon-audio.pro\/products\/bronze-dragon-interconnect\" target=\"_blank\"\u003e\u003cstrong\u003eBronze Dragon Premium Interconnects\u003c\/strong\u003e.\u003c\/a\u003e\u003cspan style=\"color: inherit; font-family: inherit; font-size: inherit; font-weight: inherit; letter-spacing: inherit; text-align: inherit; display: inline !important;\"\u003e The Bronze Dragon Interconnect is one of our best-selling cables at Moon Audio. Sold in Pairs, it is our top-of-the-line copper conductor-based interconnect. With a braided geometry and amazing shielding, this interconnect is a remarkable solution where noise isolation is key. The \u003c\/span\u003e\u003ca href=\"https:\/\/www.moon-audio.pro\/products\/bronze-dragon-power-cable\" target=\"_blank\"\u003e\u003cb\u003e\u003cfont face=\"inherit\"\u003e\u003cspan style=\"letter-spacing: inherit; text-align: inherit;\"\u003eB\u003c\/span\u003e\u003c\/font\u003eronze Dragon Power Cable\u003c\/b\u003e\u003c\/a\u003e\u003cspan style=\"color: inherit; font-family: inherit; font-size: inherit; font-weight: inherit; letter-spacing: inherit; text-align: inherit; display: inline !important;\"\u003e is also recommended to provide the cleanest and unbridled power to your high-end Headphone amplifier. Designed to brick wall any outside noise interference, it is the perfect add-on product.\u003c\/span\u003e\u003c\/p\u003e\u003c\/span\u003e\u003c\/div\u003e\n\u003cdiv class=\"builder-block builder-dad3c1fc31944cecb0f6395881873b20 css-ur9nhf\" builder-id=\"builder-dad3c1fc31944cecb0f6395881873b20\"\u003e\u003c\/div\u003e\n\u003cstyle data-emotion-css=\"h878xt\"\u003e\u003c\/style\u003e\n\u003cdiv class=\"builder-block builder-ae04669e319349cb9bb3f721e70c903d css-h878xt\" builder-id=\"builder-ae04669e319349cb9bb3f721e70c903d\"\u003e\n\u003cpicture\u003e\u003csource srcset=\"https:\/\/cdn.builder.io\/api\/v1\/image\/assets%2F48d1cdcd52ec4d289f1ef8c4f75da167%2F498dc9261e5e41948c22fe79f6ef4a98?format=webp\u0026amp;width=100 100w, https:\/\/cdn.builder.io\/api\/v1\/image\/assets%2F48d1cdcd52ec4d289f1ef8c4f75da167%2F498dc9261e5e41948c22fe79f6ef4a98?format=webp\u0026amp;width=200 200w, https:\/\/cdn.builder.io\/api\/v1\/image\/assets%2F48d1cdcd52ec4d289f1ef8c4f75da167%2F498dc9261e5e41948c22fe79f6ef4a98?format=webp\u0026amp;width=400 400w, https:\/\/cdn.builder.io\/api\/v1\/image\/assets%2F48d1cdcd52ec4d289f1ef8c4f75da167%2F498dc9261e5e41948c22fe79f6ef4a98?format=webp\u0026amp;width=800 800w, https:\/\/cdn.builder.io\/api\/v1\/image\/assets%2F48d1cdcd52ec4d289f1ef8c4f75da167%2F498dc9261e5e41948c22fe79f6ef4a98?format=webp\u0026amp;width=1200 1200w, https:\/\/cdn.builder.io\/api\/v1\/image\/assets%2F48d1cdcd52ec4d289f1ef8c4f75da167%2F498dc9261e5e41948c22fe79f6ef4a98?format=webp\u0026amp;width=1600 1600w, https:\/\/cdn.builder.io\/api\/v1\/image\/assets%2F48d1cdcd52ec4d289f1ef8c4f75da167%2F498dc9261e5e41948c22fe79f6ef4a98?format=webp\u0026amp;width=2000 2000w, https:\/\/cdn.builder.io\/api\/v1\/image\/assets%2F48d1cdcd52ec4d289f1ef8c4f75da167%2F498dc9261e5e41948c22fe79f6ef4a98?format=webp\u0026amp;width=1585 1585w\" type=\"image\/webp\"\u003e\u003cimg alt=\"Pass Labs HPA-1C Headphone Amplifier sitting on table with Audeze headphones connected via headphone cable\" loading=\"lazy\" class=\"builder-image css-1hbf805\" src=\"https:\/\/cdn.builder.io\/api\/v1\/image\/assets%2F48d1cdcd52ec4d289f1ef8c4f75da167%2F498dc9261e5e41948c22fe79f6ef4a98?width=1585\" srcset=\"https:\/\/cdn.builder.io\/api\/v1\/image\/assets%2F48d1cdcd52ec4d289f1ef8c4f75da167%2F498dc9261e5e41948c22fe79f6ef4a98?width=100 100w, https:\/\/cdn.builder.io\/api\/v1\/image\/assets%2F48d1cdcd52ec4d289f1ef8c4f75da167%2F498dc9261e5e41948c22fe79f6ef4a98?width=200 200w, https:\/\/cdn.builder.io\/api\/v1\/image\/assets%2F48d1cdcd52ec4d289f1ef8c4f75da167%2F498dc9261e5e41948c22fe79f6ef4a98?width=400 400w, https:\/\/cdn.builder.io\/api\/v1\/image\/assets%2F48d1cdcd52ec4d289f1ef8c4f75da167%2F498dc9261e5e41948c22fe79f6ef4a98?width=800 800w, https:\/\/cdn.builder.io\/api\/v1\/image\/assets%2F48d1cdcd52ec4d289f1ef8c4f75da167%2F498dc9261e5e41948c22fe79f6ef4a98?width=1200 1200w, https:\/\/cdn.builder.io\/api\/v1\/image\/assets%2F48d1cdcd52ec4d289f1ef8c4f75da167%2F498dc9261e5e41948c22fe79f6ef4a98?width=1600 1600w, https:\/\/cdn.builder.io\/api\/v1\/image\/assets%2F48d1cdcd52ec4d289f1ef8c4f75da167%2F498dc9261e5e41948c22fe79f6ef4a98?width=2000 2000w, https:\/\/cdn.builder.io\/api\/v1\/image\/assets%2F48d1cdcd52ec4d289f1ef8c4f75da167%2F498dc9261e5e41948c22fe79f6ef4a98?width=1585 1585w\" sizes=\"(max-width: 638px) 92vw, (max-width: 998px) 59vw, 114vw\"\u003e\u003c\/picture\u003e\u003cstyle data-emotion-css=\"1a1th9v\"\u003e\u003c\/style\u003e\n\u003cdiv class=\"builder-image-sizer css-1a1th9v\"\u003e \u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"builder-block builder-36f78fdccce54002b6f3f151b5e7cade css-ur9nhf\" builder-id=\"builder-36f78fdccce54002b6f3f151b5e7cade\"\u003e\u003c\/div\u003e\n\u003cstyle data-emotion-css=\"17t32og\"\u003e\u003c\/style\u003e\n\u003cdiv class=\"builder-block builder-edd7a4008a304e90be50e8456c4a09de builder-has-component css-17t32og\" builder-id=\"builder-edd7a4008a304e90be50e8456c4a09de\"\u003e\u003cdiv class=\"builder-columns css-1840m1q\"\u003e\n\u003cstyle data-emotion-css=\"1vigfr\"\u003e\u003c\/style\u003e\n\u003cdiv class=\"builder-column css-1vigfr\"\u003e\u003cdiv class=\"builder-blocks builder-blocks-child css-h47494\" builder-type=\"blocks\" builder-parent-id=\"builder-edd7a4008a304e90be50e8456c4a09de\"\u003e\u003cdiv class=\"builder-block builder-517858344a4145349742fde173339d85 builder-has-component css-hgfgng\" builder-id=\"builder-517858344a4145349742fde173339d85\"\u003e\u003cspan class=\"builder-text css-1qggkls\"\u003e\u003cp\u003eThe HPA-1c is, at the moment, the only Pass Lab product specifically aimed at the personal stereo\/headphone market. It was optimized around headphones with impedances between 15 ohms and 600 ohms and originally targeted the newly emerging planar magnetic \"over ear' headphone use. The input JFET stage was modeled after some of Pass Labs in-house phono-stage circuit topologies, taking advantage of their relatively low noise and ability to provide a rich and detailed soundstage. Due to the discontinuation of the current JFET input stage, this also led to improvements to the amplifier. The output stage is a direct-coupled MOSTET-based circuit taking advantage of their ability to drive a wide range of impedances with very little feedback.\u003c\/p\u003e\u003c\/span\u003e\u003c\/div\u003e\u003c\/div\u003e\u003c\/div\u003e\n\u003cstyle data-emotion-css=\"zy4j2t\"\u003e\u003c\/style\u003e\n\u003cdiv class=\"builder-column css-zy4j2t\"\u003e\u003cdiv class=\"builder-blocks builder-blocks-child css-h47494\" builder-type=\"blocks\" builder-parent-id=\"builder-edd7a4008a304e90be50e8456c4a09de\"\u003e\u003cdiv class=\"builder-block builder-8cef5382b2c34c35a720e3dad6169f35 css-1y6p72u\" builder-id=\"builder-8cef5382b2c34c35a720e3dad6169f35\"\u003e\n\u003cpicture\u003e\u003csource srcset=\"https:\/\/cdn.builder.io\/api\/v1\/image\/assets%2F48d1cdcd52ec4d289f1ef8c4f75da167%2Fd77ce0eda22b4f89a85fb7adb1ff998f?format=webp\u0026amp;width=100 100w, https:\/\/cdn.builder.io\/api\/v1\/image\/assets%2F48d1cdcd52ec4d289f1ef8c4f75da167%2Fd77ce0eda22b4f89a85fb7adb1ff998f?format=webp\u0026amp;width=200 200w, https:\/\/cdn.builder.io\/api\/v1\/image\/assets%2F48d1cdcd52ec4d289f1ef8c4f75da167%2Fd77ce0eda22b4f89a85fb7adb1ff998f?format=webp\u0026amp;width=400 400w, https:\/\/cdn.builder.io\/api\/v1\/image\/assets%2F48d1cdcd52ec4d289f1ef8c4f75da167%2Fd77ce0eda22b4f89a85fb7adb1ff998f?format=webp\u0026amp;width=800 800w, https:\/\/cdn.builder.io\/api\/v1\/image\/assets%2F48d1cdcd52ec4d289f1ef8c4f75da167%2Fd77ce0eda22b4f89a85fb7adb1ff998f?format=webp\u0026amp;width=1200 1200w, https:\/\/cdn.builder.io\/api\/v1\/image\/assets%2F48d1cdcd52ec4d289f1ef8c4f75da167%2Fd77ce0eda22b4f89a85fb7adb1ff998f?format=webp\u0026amp;width=1600 1600w, https:\/\/cdn.builder.io\/api\/v1\/image\/assets%2F48d1cdcd52ec4d289f1ef8c4f75da167%2Fd77ce0eda22b4f89a85fb7adb1ff998f?format=webp\u0026amp;width=2000 2000w, https:\/\/cdn.builder.io\/api\/v1\/image\/assets%2F48d1cdcd52ec4d289f1ef8c4f75da167%2Fd77ce0eda22b4f89a85fb7adb1ff998f?format=webp\u0026amp;width=778 778w\" type=\"image\/webp\"\u003e\u003cimg alt=\"Pass Labs HPA-1c logo\" loading=\"lazy\" class=\"builder-image css-1hbf805\" src=\"https:\/\/cdn.builder.io\/api\/v1\/image\/assets%2F48d1cdcd52ec4d289f1ef8c4f75da167%2Fd77ce0eda22b4f89a85fb7adb1ff998f?width=778\" srcset=\"https:\/\/cdn.builder.io\/api\/v1\/image\/assets%2F48d1cdcd52ec4d289f1ef8c4f75da167%2Fd77ce0eda22b4f89a85fb7adb1ff998f?width=100 100w, https:\/\/cdn.builder.io\/api\/v1\/image\/assets%2F48d1cdcd52ec4d289f1ef8c4f75da167%2Fd77ce0eda22b4f89a85fb7adb1ff998f?width=200 200w, https:\/\/cdn.builder.io\/api\/v1\/image\/assets%2F48d1cdcd52ec4d289f1ef8c4f75da167%2Fd77ce0eda22b4f89a85fb7adb1ff998f?width=400 400w, https:\/\/cdn.builder.io\/api\/v1\/image\/assets%2F48d1cdcd52ec4d289f1ef8c4f75da167%2Fd77ce0eda22b4f89a85fb7adb1ff998f?width=800 800w, https:\/\/cdn.builder.io\/api\/v1\/image\/assets%2F48d1cdcd52ec4d289f1ef8c4f75da167%2Fd77ce0eda22b4f89a85fb7adb1ff998f?width=1200 1200w, https:\/\/cdn.builder.io\/api\/v1\/image\/assets%2F48d1cdcd52ec4d289f1ef8c4f75da167%2Fd77ce0eda22b4f89a85fb7adb1ff998f?width=1600 1600w, https:\/\/cdn.builder.io\/api\/v1\/image\/assets%2F48d1cdcd52ec4d289f1ef8c4f75da167%2Fd77ce0eda22b4f89a85fb7adb1ff998f?width=2000 2000w, https:\/\/cdn.builder.io\/api\/v1\/image\/assets%2F48d1cdcd52ec4d289f1ef8c4f75da167%2Fd77ce0eda22b4f89a85fb7adb1ff998f?width=778 778w\" sizes=\"(max-width: 638px) 92vw, (max-width: 998px) 28vw, 56vw\"\u003e\u003c\/picture\u003e\u003cstyle data-emotion-css=\"fgujgt\"\u003e\u003c\/style\u003e\n\u003cdiv class=\"builder-image-sizer css-fgujgt\"\u003e \u003c\/div\u003e\n\u003c\/div\u003e\u003c\/div\u003e\u003c\/div\u003e\n\u003c\/div\u003e\u003c\/div\u003e\n\u003cstyle data-emotion-css=\"uk7b2m\"\u003e\u003c\/style\u003e\n\u003cdiv class=\"builder-block builder-262c82eb56ea403faf060ef85269c8f7 builder-has-component css-uk7b2m\" builder-id=\"builder-262c82eb56ea403faf060ef85269c8f7\"\u003e\u003cspan class=\"builder-text css-1qggkls\"\u003e\u003cp\u003ePlanar magnetic drivers generally fall into a class of drivers requiring medium amounts of power. The HPA-1c serves this market with distinction. Falling outside of the medium power \"main-steam\" requirement, headphone users often use very high efficiency IEM (in-ear monitors) or very low efficiency \"Ear Speakers\". The HPA-1c should not, however, be dismissed out of hand for either of these applications. High efficiency devices call for extraordinarily low noise circuits, and low efficiency ear speakers at times require very high power. The HPA-1c offers what these products demand.\u003c\/p\u003e\u003c\/span\u003e\u003c\/div\u003e\n\u003cstyle data-emotion-css=\"y78l3w\"\u003e\u003c\/style\u003e\n\u003cdiv class=\"builder-block builder-b67fcdd064af4ebd8ae78ff9d86475e4 builder-has-component css-y78l3w\" builder-id=\"builder-b67fcdd064af4ebd8ae78ff9d86475e4\"\u003e\u003cspan class=\"builder-text css-1qggkls\"\u003e\u003cp\u003eThe same warmth, body, and drive the HPA-1c imparts to the headphone experience translates to how it sounds as a single-ended (RCA connection) line-stage. If you have a power-amp and loudspeakers that need a little additional authority, the HPA-1c might be the perfect addition, with the added benefit of being headphone-friendly.\u003c\/p\u003e\u003c\/span\u003e\u003c\/div\u003e\n\u003cstyle data-emotion-css=\"15auezb\"\u003e\u003c\/style\u003e\n\u003cdiv class=\"builder-block builder-78a50c5ca1d84a21ba37b9c3688f7f3f builder-has-component css-15auezb\" builder-id=\"builder-78a50c5ca1d84a21ba37b9c3688f7f3f\"\u003e\u003cspan class=\"builder-text css-1qggkls\"\u003e\u003ch3\u003eDesigned to Drive Headphones With Ease\u003c\/h3\u003e\u003c\/span\u003e\u003c\/div\u003e\n\u003cstyle data-emotion-css=\"ri79nn\"\u003e\u003c\/style\u003e\n\u003cdiv class=\"builder-block builder-1643e7410016472992df5088ff554c7f builder-has-component css-ri79nn\" builder-id=\"builder-1643e7410016472992df5088ff554c7f\"\u003e\u003cspan class=\"builder-text css-1qggkls\"\u003e\u003cp\u003eThe Pass Labs HPA-1c was originally designed as a power amplifier to allow the amp to drive low impedance planar magnetic headphones. You'll find a Class A headphone amp that can drive any headphone in the 15-600 ohms range with complete ease. The HPA-1c features an incredible dynamic range across the entire frequency response spectrum, resulting in amazingly robust sound quality and an impactful listening experience every time you put on a pair of headphones.\u003c\/p\u003e\u003c\/span\u003e\u003c\/div\u003e\n\u003cstyle data-emotion-css=\"140jzjb\"\u003e\u003c\/style\u003e\n\u003cdiv class=\"builder-block builder-bbf0ce762e2147f18caaeeaf96610ac2 builder-has-component css-140jzjb\" builder-id=\"builder-bbf0ce762e2147f18caaeeaf96610ac2\"\u003e\u003cspan class=\"builder-text css-1qggkls\"\u003e\u003cp\u003ePass labs created a truly unique headphone amplifier with the HPA-1c - it's not every day that a company designs a power amplifier concept only to turn it into a headphone amp later. Pass Labs pulled out all the stops with a Class A amplifier, offering major performance gains over competitors in similar price ranges. At the heart of the HPA-1c you'll find a custom, low-noise, shielded toroidal power transformer that feeds a discrete power supply for the audio circuits. It's important to note that Pass Labs designed the power supply this way for extremely low noise and superior isolation for the audio circuit. The quality of the power supply goes a long way towards the sound quality of a headphone amplifier, and the Pass Labs HPA-1c is second to none.\u003c\/p\u003e\u003c\/span\u003e\u003c\/div\u003e\n\u003cdiv class=\"builder-block builder-43b35d2e35794186947cdd12676c660a builder-has-component css-15auezb\" builder-id=\"builder-43b35d2e35794186947cdd12676c660a\"\u003e\u003cspan class=\"builder-text css-1qggkls\"\u003e\u003ch3\u003eHigh-End Design With High-End Features\u003c\/h3\u003e\u003c\/span\u003e\u003c\/div\u003e\n\u003cdiv class=\"builder-block builder-19ee95cd8e1347c0b12eb33874290c2b builder-has-component css-uk7b2m\" builder-id=\"builder-19ee95cd8e1347c0b12eb33874290c2b\"\u003e\u003cspan class=\"builder-text css-1qggkls\"\u003e\u003cp\u003eThe HPA-1c features low-feedback and wide-bandwidth discrete amplifier circuit designs, specifically utilizing J-Fet input stages and Class A biased, direct-coupled MOSFET output stages. This helps the HPA-1c to drive headphones with loads between 15-600 ohms with efficiency. No matter if your headphones are dynamic drivers or even the more power-hungry planar magnetic drivers, the HPA-1c Headphone Amplifier is up to the task. The amp offers an incredibly rich and detailed music presentation and a dynamic performance with all the power that the amplifier is capable of outputting.\u003c\/p\u003e\u003c\/span\u003e\u003c\/div\u003e\n\u003cstyle data-emotion-css=\"1zyzeo\"\u003e\u003c\/style\u003e\n\u003cdiv class=\"builder-block builder-88e1bf770e9c46f78bcdbdeeb56eb3ac builder-has-component css-1zyzeo\" builder-id=\"builder-88e1bf770e9c46f78bcdbdeeb56eb3ac\"\u003e\u003cdiv class=\"builder-columns css-1840m1q\"\u003e\n\u003cstyle data-emotion-css=\"2keume\"\u003e\u003c\/style\u003e\n\u003cdiv class=\"builder-column css-2keume\"\u003e\u003cdiv class=\"builder-blocks builder-blocks-child css-h47494\" builder-type=\"blocks\" builder-parent-id=\"builder-88e1bf770e9c46f78bcdbdeeb56eb3ac\"\u003e\u003cdiv class=\"builder-block builder-85b0309c62b94f0f8bdca124180f7c45 css-1y6p72u\" builder-id=\"builder-85b0309c62b94f0f8bdca124180f7c45\"\u003e\n\u003cpicture\u003e\u003csource srcset=\"https:\/\/cdn.builder.io\/api\/v1\/image\/assets%2F48d1cdcd52ec4d289f1ef8c4f75da167%2F5ce62d0fe377471eadff5411641215ce?format=webp\u0026amp;width=100 100w, https:\/\/cdn.builder.io\/api\/v1\/image\/assets%2F48d1cdcd52ec4d289f1ef8c4f75da167%2F5ce62d0fe377471eadff5411641215ce?format=webp\u0026amp;width=200 200w, https:\/\/cdn.builder.io\/api\/v1\/image\/assets%2F48d1cdcd52ec4d289f1ef8c4f75da167%2F5ce62d0fe377471eadff5411641215ce?format=webp\u0026amp;width=400 400w, https:\/\/cdn.builder.io\/api\/v1\/image\/assets%2F48d1cdcd52ec4d289f1ef8c4f75da167%2F5ce62d0fe377471eadff5411641215ce?format=webp\u0026amp;width=800 800w, https:\/\/cdn.builder.io\/api\/v1\/image\/assets%2F48d1cdcd52ec4d289f1ef8c4f75da167%2F5ce62d0fe377471eadff5411641215ce?format=webp\u0026amp;width=1200 1200w, https:\/\/cdn.builder.io\/api\/v1\/image\/assets%2F48d1cdcd52ec4d289f1ef8c4f75da167%2F5ce62d0fe377471eadff5411641215ce?format=webp\u0026amp;width=1600 1600w, https:\/\/cdn.builder.io\/api\/v1\/image\/assets%2F48d1cdcd52ec4d289f1ef8c4f75da167%2F5ce62d0fe377471eadff5411641215ce?format=webp\u0026amp;width=2000 2000w, https:\/\/cdn.builder.io\/api\/v1\/image\/assets%2F48d1cdcd52ec4d289f1ef8c4f75da167%2F5ce62d0fe377471eadff5411641215ce?format=webp\u0026amp;width=783 783w\" type=\"image\/webp\"\u003e\u003cimg alt=\"Pass Labs HPA-1C volume control\" loading=\"lazy\" class=\"builder-image css-1hbf805\" src=\"https:\/\/cdn.builder.io\/api\/v1\/image\/assets%2F48d1cdcd52ec4d289f1ef8c4f75da167%2F5ce62d0fe377471eadff5411641215ce?width=783\" srcset=\"https:\/\/cdn.builder.io\/api\/v1\/image\/assets%2F48d1cdcd52ec4d289f1ef8c4f75da167%2F5ce62d0fe377471eadff5411641215ce?width=100 100w, https:\/\/cdn.builder.io\/api\/v1\/image\/assets%2F48d1cdcd52ec4d289f1ef8c4f75da167%2F5ce62d0fe377471eadff5411641215ce?width=200 200w, https:\/\/cdn.builder.io\/api\/v1\/image\/assets%2F48d1cdcd52ec4d289f1ef8c4f75da167%2F5ce62d0fe377471eadff5411641215ce?width=400 400w, https:\/\/cdn.builder.io\/api\/v1\/image\/assets%2F48d1cdcd52ec4d289f1ef8c4f75da167%2F5ce62d0fe377471eadff5411641215ce?width=800 800w, https:\/\/cdn.builder.io\/api\/v1\/image\/assets%2F48d1cdcd52ec4d289f1ef8c4f75da167%2F5ce62d0fe377471eadff5411641215ce?width=1200 1200w, https:\/\/cdn.builder.io\/api\/v1\/image\/assets%2F48d1cdcd52ec4d289f1ef8c4f75da167%2F5ce62d0fe377471eadff5411641215ce?width=1600 1600w, https:\/\/cdn.builder.io\/api\/v1\/image\/assets%2F48d1cdcd52ec4d289f1ef8c4f75da167%2F5ce62d0fe377471eadff5411641215ce?width=2000 2000w, https:\/\/cdn.builder.io\/api\/v1\/image\/assets%2F48d1cdcd52ec4d289f1ef8c4f75da167%2F5ce62d0fe377471eadff5411641215ce?width=783 783w\" sizes=\"(max-width: 638px) 92vw, (max-width: 998px) 29vw, 56vw\"\u003e\u003c\/picture\u003e\u003cstyle data-emotion-css=\"qjm9kp\"\u003e\u003c\/style\u003e\n\u003cdiv class=\"builder-image-sizer css-qjm9kp\"\u003e \u003c\/div\u003e\n\u003c\/div\u003e\u003c\/div\u003e\u003c\/div\u003e\n\u003cstyle data-emotion-css=\"bst442\"\u003e\u003c\/style\u003e\n\u003cdiv class=\"builder-column css-bst442\"\u003e\u003cdiv class=\"builder-blocks builder-blocks-child css-h47494\" builder-type=\"blocks\" builder-parent-id=\"builder-88e1bf770e9c46f78bcdbdeeb56eb3ac\"\u003e\u003cdiv class=\"builder-block builder-2ba82c559ce645c8b4108caed27fae75 css-1y6p72u\" builder-id=\"builder-2ba82c559ce645c8b4108caed27fae75\"\u003e\n\u003cpicture\u003e\u003csource srcset=\"https:\/\/cdn.builder.io\/api\/v1\/image\/assets%2F48d1cdcd52ec4d289f1ef8c4f75da167%2F0997eb3092204f1b9db21ded2f9fa639?format=webp\u0026amp;width=100 100w, https:\/\/cdn.builder.io\/api\/v1\/image\/assets%2F48d1cdcd52ec4d289f1ef8c4f75da167%2F0997eb3092204f1b9db21ded2f9fa639?format=webp\u0026amp;width=200 200w, https:\/\/cdn.builder.io\/api\/v1\/image\/assets%2F48d1cdcd52ec4d289f1ef8c4f75da167%2F0997eb3092204f1b9db21ded2f9fa639?format=webp\u0026amp;width=400 400w, https:\/\/cdn.builder.io\/api\/v1\/image\/assets%2F48d1cdcd52ec4d289f1ef8c4f75da167%2F0997eb3092204f1b9db21ded2f9fa639?format=webp\u0026amp;width=800 800w, https:\/\/cdn.builder.io\/api\/v1\/image\/assets%2F48d1cdcd52ec4d289f1ef8c4f75da167%2F0997eb3092204f1b9db21ded2f9fa639?format=webp\u0026amp;width=1200 1200w, https:\/\/cdn.builder.io\/api\/v1\/image\/assets%2F48d1cdcd52ec4d289f1ef8c4f75da167%2F0997eb3092204f1b9db21ded2f9fa639?format=webp\u0026amp;width=1600 1600w, https:\/\/cdn.builder.io\/api\/v1\/image\/assets%2F48d1cdcd52ec4d289f1ef8c4f75da167%2F0997eb3092204f1b9db21ded2f9fa639?format=webp\u0026amp;width=2000 2000w, https:\/\/cdn.builder.io\/api\/v1\/image\/assets%2F48d1cdcd52ec4d289f1ef8c4f75da167%2F0997eb3092204f1b9db21ded2f9fa639?format=webp\u0026amp;width=783 783w\" type=\"image\/webp\"\u003e\u003cimg alt=\"Pass Labs logo\" loading=\"lazy\" class=\"builder-image css-1hbf805\" src=\"https:\/\/cdn.builder.io\/api\/v1\/image\/assets%2F48d1cdcd52ec4d289f1ef8c4f75da167%2F0997eb3092204f1b9db21ded2f9fa639?width=783\" srcset=\"https:\/\/cdn.builder.io\/api\/v1\/image\/assets%2F48d1cdcd52ec4d289f1ef8c4f75da167%2F0997eb3092204f1b9db21ded2f9fa639?width=100 100w, https:\/\/cdn.builder.io\/api\/v1\/image\/assets%2F48d1cdcd52ec4d289f1ef8c4f75da167%2F0997eb3092204f1b9db21ded2f9fa639?width=200 200w, https:\/\/cdn.builder.io\/api\/v1\/image\/assets%2F48d1cdcd52ec4d289f1ef8c4f75da167%2F0997eb3092204f1b9db21ded2f9fa639?width=400 400w, https:\/\/cdn.builder.io\/api\/v1\/image\/assets%2F48d1cdcd52ec4d289f1ef8c4f75da167%2F0997eb3092204f1b9db21ded2f9fa639?width=800 800w, https:\/\/cdn.builder.io\/api\/v1\/image\/assets%2F48d1cdcd52ec4d289f1ef8c4f75da167%2F0997eb3092204f1b9db21ded2f9fa639?width=1200 1200w, https:\/\/cdn.builder.io\/api\/v1\/image\/assets%2F48d1cdcd52ec4d289f1ef8c4f75da167%2F0997eb3092204f1b9db21ded2f9fa639?width=1600 1600w, https:\/\/cdn.builder.io\/api\/v1\/image\/assets%2F48d1cdcd52ec4d289f1ef8c4f75da167%2F0997eb3092204f1b9db21ded2f9fa639?width=2000 2000w, https:\/\/cdn.builder.io\/api\/v1\/image\/assets%2F48d1cdcd52ec4d289f1ef8c4f75da167%2F0997eb3092204f1b9db21ded2f9fa639?width=783 783w\" sizes=\"(max-width: 638px) 92vw, (max-width: 998px) 29vw, 56vw\"\u003e\u003c\/picture\u003e\u003cdiv class=\"builder-image-sizer css-qjm9kp\"\u003e \u003c\/div\u003e\n\u003c\/div\u003e\u003c\/div\u003e\u003c\/div\u003e\n\u003c\/div\u003e\u003c\/div\u003e\n\u003cstyle data-emotion-css=\"1puxson\"\u003e\u003c\/style\u003e\n\u003cdiv class=\"builder-block builder-545e4153eb9b46468083f40f0aa485a6 builder-has-component css-1puxson\" builder-id=\"builder-545e4153eb9b46468083f40f0aa485a6\"\u003e\u003cspan class=\"builder-text css-1qggkls\"\u003e\u003cp\u003eThe HPA-1c features a quarter-inch single-ended headphone jack on the front panel, a large volume control\/rotary knob that is connected to an ALPS potentiometer, and three buttons that select input or engage the preamp output. On the rear panel, you'll find two pairs of single-ended analog inputs via RCA jacks, a set of switchable \"preamp\" line-level output jacks, the power switch, and the fuse. The HPA-1c is designed with the customary brushed-aluminum chassis that matches the rest of the Pass Labs product lineup. Sleek and refined - modern and high-end.\u003c\/p\u003e\u003c\/span\u003e\u003c\/div\u003e\n\u003cstyle data-emotion-css=\"1c6hqsn\"\u003e\u003c\/style\u003e\n\u003cdiv class=\"builder-block builder-338500c5f2bb41608281b4c92a94486d builder-has-component css-1c6hqsn\" builder-id=\"builder-338500c5f2bb41608281b4c92a94486d\"\u003e\u003cdiv class=\"builder-columns css-1840m1q\"\u003e\n\u003cdiv class=\"builder-column css-2keume\"\u003e\u003cdiv class=\"builder-blocks builder-blocks-child css-h47494\" builder-type=\"blocks\" builder-parent-id=\"builder-338500c5f2bb41608281b4c92a94486d\"\u003e\n\u003cdiv class=\"builder-block builder-3fae7639d4054b4eb1d9e0b2e90b667f builder-has-component css-hgfgng\" builder-id=\"builder-3fae7639d4054b4eb1d9e0b2e90b667f\"\u003e\u003cspan class=\"builder-text css-1qggkls\"\u003e\u003ch3\u003eFeatures:\u003c\/h3\u003e\u003c\/span\u003e\u003c\/div\u003e\n\u003cdiv class=\"builder-block builder-db08495e399049eba7296f7cda2bfe04 builder-has-component css-hgfgng\" builder-id=\"builder-db08495e399049eba7296f7cda2bfe04\"\u003e\u003cspan class=\"builder-text css-1qggkls\"\u003e\u003cul\u003e\n\u003cli\u003eWorks with headphones with impedances of 15 ohms to 600 ohms.\u003c\/li\u003e\n\u003cli\u003eDesigned as a power amplifier rather than a typical headphone amplifier to be able to drive low impedance planar headphones.\u003c\/li\u003e\n\u003cli\u003eLow feedback wide bandwidth discreet design.\u003c\/li\u003e\n\u003cli\u003eClass A direct coupled Mosfet output stage.\u003c\/li\u003e\n\u003cli\u003eCustom low noise Toroidal power transformer with a Faraday shield.\u003c\/li\u003e\n\u003cli\u003eDiscreet regulated power supply for audio circuits.\u003c\/li\u003e\n\u003c\/ul\u003e\u003c\/span\u003e\u003c\/div\u003e\n\u003c\/div\u003e\u003c\/div\u003e\n\u003cdiv class=\"builder-column css-bst442\"\u003e\u003cdiv class=\"builder-blocks builder-blocks-child css-h47494\" builder-type=\"blocks\" builder-parent-id=\"builder-338500c5f2bb41608281b4c92a94486d\"\u003e\n\u003cdiv class=\"builder-block builder-08876629691d4e89a6160e31ea147545 builder-has-component css-hgfgng\" builder-id=\"builder-08876629691d4e89a6160e31ea147545\"\u003e\u003cspan class=\"builder-text css-1qggkls\"\u003e\u003ch3\u003eWhat's in the Box?\u003c\/h3\u003e\u003c\/span\u003e\u003c\/div\u003e\n\u003cdiv class=\"builder-block builder-78dd8c1336b142878473f0e1214e1779 builder-has-component css-hgfgng\" builder-id=\"builder-78dd8c1336b142878473f0e1214e1779\"\u003e\u003cspan class=\"builder-text css-1qggkls\"\u003e\u003cul\u003e\n\u003cli\u003eHPA-1c Headphone Amplifier\u003c\/li\u003e\n\u003cli\u003ePower Cable\u003c\/li\u003e\n\u003cli\u003eManual and Warranty\u003c\/li\u003e\n\u003c\/ul\u003e\u003c\/span\u003e\u003c\/div\u003e\n\u003c\/div\u003e\u003c\/div\u003e\n\u003c\/div\u003e\u003c\/div\u003e\n\u003cdiv class=\"builder-block builder-b9b1e882024a4dfa8d22bdf5af0d3fa1 css-ur9nhf\" builder-id=\"builder-b9b1e882024a4dfa8d22bdf5af0d3fa1\"\u003e\u003c\/div\u003e\n\u003cdiv class=\"builder-block builder-22771a815d2c46c9a4fa3370ca08cd87 builder-has-component css-15auezb\" builder-id=\"builder-22771a815d2c46c9a4fa3370ca08cd87\"\u003e\u003cspan class=\"builder-text css-1qggkls\"\u003e\u003cdiv data-meisternote=\"true\"\u003e\u003ch3\u003ePass Labs and First Watt\u003c\/h3\u003e\u003c\/div\u003e\u003c\/span\u003e\u003c\/div\u003e\n\u003cstyle data-emotion-css=\"n2frk1\"\u003e\u003c\/style\u003e\n\u003cdiv class=\"builder-block builder-0e58171ee2754e0f832d6c93499d827f builder-has-component css-n2frk1\" builder-id=\"builder-0e58171ee2754e0f832d6c93499d827f\"\u003e\u003cspan class=\"builder-text css-1qggkls\"\u003e\u003cp\u003ePass Labs and First Watt were founded by hi-fi legend Nelson Pass. After co-founding and later selling Threshold Audio, Pass began working out of his Auburn, California, home in the early 1990s to develop prototypes of single-ended Class A amplifier designs under the name Pass Labs. Pass Labs quickly became known for its commercially produced Aleph, X, and XA Series amps, and preamps. Pass later started First Watt as a passion project focusing on low-power amps for a niche audiophile audience. Today, Pass splits his time between the two companies, with production happening in Pass Labs' facility in Foresthill, California, USA. Some of Pass Lab’s most notable products include the HPA-1c Headphone Amplifier, their integrated amp series (featuring the Pass Labs INT-25, Pass Labs INT-60, and the Pass Labs INT-250), the Pass Labs XA25, and more. If you’re looking for a monoblock amplifier, stereo amplifier, integrated amplifier, or headphone amplifier, then Pass Labs has everything you need for your high-end audio. Visit passlabs.com for more info.\u003c\/p\u003e\u003c\/span\u003e\u003c\/div\u003e\n\u003cdiv class=\"builder-block builder-663c39f3aaad4773a3672408c933e346 css-ur9nhf\" builder-id=\"builder-663c39f3aaad4773a3672408c933e346\"\u003e\u003c\/div\u003e\n\u003cdiv class=\"builder-block builder-28c88d1171104b64a3de121471d58945 builder-has-component css-15auezb\" builder-id=\"builder-28c88d1171104b64a3de121471d58945\"\u003e\u003cspan class=\"builder-text css-1qggkls\"\u003e\u003ch3\u003eFAQ\u003c\/h3\u003e\u003c\/span\u003e\u003c\/div\u003e\n\u003cstyle data-emotion-css=\"wwb51i\"\u003e\u003c\/style\u003e\n\u003cdiv class=\"builder-block builder-53da9d05b63e45c3af1d8639553434a0 builder-has-component css-wwb51i\" builder-id=\"builder-53da9d05b63e45c3af1d8639553434a0\"\u003e\u003cspan class=\"builder-text css-1qggkls\"\u003e\u003cp\u003e\u003cstrong\u003eWhat makes the Pass Labs HPA-1c a standout headphone amplifier?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThe Pass Labs HPA-1c is designed more like a power amplifier than a typical headphone amp. It features a high-bias Class A operation with a discrete JFET input stage and a MOSFET output stage, providing high power and excellent sound quality. Its design ensures low noise and wide bandwidth, making it suitable for a wide range of headphones from 15 to 600 ohms​. It has excellent tonality and midrange, making it a solid choice for audiophiles everywhere.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eCan the HPA-1c drive high-impedance headphones effectively?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eYes, the HPA-1c can drive high-impedance headphones, such as the Beyer Dynamics DT880 with 600 ohms, with ease. Users report that it delivers good dynamics and volume even with hard-to-drive headphones, demonstrating its robust power and stability​.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eHow does the HPA-1c perform as a preamplifier?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eIn addition to being a high-quality headphone amplifier, the HPA-1c also functions as a capable line preamplifier. It has two single-ended inputs and can be used for general system duties, although it lacks a remote control and balanced connections. Its minimalist design is appreciated for its simplicity and high performance​. The input impedance, output impedance, and the overall output power make the HPA-1c a versatile piece of audiophile equipment.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhat is the build quality of the Pass Labs HPA-1c?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThe HPA-1c boasts exceptional build quality, consistent with other Pass Labs products. It features a robust chassis made of brushed aluminum and includes high-quality components such as a custom toroidal transformer with mu-metal shielding to reduce noise​. The large volume knob is a design delight.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhy does the HPA-1c not include an internal DAC?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003ePass Labs chose not to include an internal DAC in the HPA-1c to ensure longevity and timelessness. DAC technology evolves rapidly, often becoming obsolete within a few years. By separating the amplifier from the DAC, Pass Labs ensures that the HPA-1c remains a relevant high-end audio and high-performing piece of equipment for many years​.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eHow does the sound quality of the HPA-1c compare with other high-end headphone amplifiers?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003ehe HPA-1c delivers a spacious soundstage, vivid detail retrieval, and excellent dynamics. It competes with and sometimes outperforms amplifiers that are much more expensive, providing smooth, non-fatiguing sound with a natural presentation of vocals and instruments​.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhat is the power output of the Pass Labs HPA-1c Headphone Amplifier?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThe Pass Labs HPA-1c offers a robust power output suitable for a wide range of headphones. It delivers up to 2 Watts in 30 ohms, providing ample power for demanding high-impedance headphones. This ensures a clean and dynamic sound even at higher volumes, maintaining fidelity and clarity.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eDoes the Pass Labs HPA-1c support balanced headphone connections?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eNo, the Pass Labs HPA-1c features only single-ended headphone outputs. It includes a 1\/4-inch (6.35mm) stereo single-ended output.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhat type of volume control does the Pass Labs HPA-1c use?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThe Pass Labs HPA-1c utilizes a precision-stepped relay volume control, providing accurate and repeatable volume adjustments. This design ensures precise level matching between left and right channels, maintaining the integrity of the audio signal. Users can easily fine-tune the volume to their preference with the smooth and reliable stepped attenuator.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWho is Nelson Pass?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eNelson Pass, the man behind Pass Labs and First Watt, has been designing and building amplifiers for decades. His early passion, however, was speakers; at age 14, he started assembling loudspeakers. As a college student studying physics at the University of California-Davis, he co-founded a speaker company called PMA. He also worked for ESS, where he designed crossovers and enclosures. After college, with his interest having shifted toward amplifiers, Pass co-founded Threshold Electronics (now Threshold Audio). His achievements during the Threshold years include developing the first dynamically biased Class A amplifier circuit, developing a fully cascode audio power amplifier, and developing the STASIS stereo preamplifier and power amplifier. During the 1980s, Pass designed the Adcom GFA-555 amplifier. Later, after selling Threshold, he started Pass Labs in 1991 and First Watt in 1997. Pass holds several patents related to audio circuits.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eHow did Pass Labs make its name?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003ePass Labs helped popularize solid-state, Class A power amplifiers. Pass Labs' first product, the Aleph 0 amplifier, operated as a single-ended Class A up to its 70-watt rating and in push-pull Class A at higher wattage. The Aleph series of amplifiers, some of the first solid-state amps that were said to be \"tube-like\" in sound, operated in pure class A and contained internal circuitry using MOSFETs. The Aleph amplifiers had a unique appearance, a cube with heat sinks on all four sides, a solution to the heat generated by the class-A design. This can be attributed primarily to the specific MOSFETs used and the minimum number of gain stages that were implemented in the design. Pass Labs also developed the Super-Symmetry™ (\"Su-Sy\") circuit, which achieves exceptionally low distortion and noise levels. In 1998, Pass Labs released the X1000, the first amplifier using the patented SuperSymmetric™ topology. The X1000 achieved 1000 watts with high performance, local feedback, and only two gain stages: a cascaded differential pair of transistors and a large bank of complementary output followers. This groundbreaking design informed all subsequent Pass Labs amplifiers.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhat else does Pass Labs make?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eIn 2002, Pass Labs unveiled the first XA amplifiers, combining the X and Aleph topologies into balanced single-ended Class A amplifiers with many of the characteristics of both the X and Aleph series. The current Pass Labs lineup includes Class A amps (XA and Xs Series), Class AB amps (.8 Series), line preamps (Xs and XP Series), phono preamps (Xs and XP Series), integrated amps (INT Series), and one headphone amp.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhat is the relationship between Pass Labs and First Watt?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eWhen he started Pass Labs, Pass did everything out of his home. In 1997, having outgrown the space, Pass Labs moved into commercial space in Foresthill, California. When Pass started First Watt, it was a \"kitchen table\" venture, with work once again happening in his home. In 2016, with production demands not leaving him enough time to pursue the vast array of yet-to-be-designed amps, Nelson handed the business end of First Watt over to Pass Labs. Pass Labs took over the building of First Watt amplifiers as well as marketing and distribution. There's a synergy between the two operations in that Pass Labs gets to gather up some of the more interesting First Watt finds and repurpose them as more commercially viable designs. Today, Pass splits his time between First Watt and Pass Laboratories.\u003c\/p\u003e\u003c\/span\u003e\u003c\/div\u003e\n\u003cdiv class=\"builder-block builder-577b53b24d0e49ea8c1ed0d1a01e1082 css-ur9nhf\" builder-id=\"builder-577b53b24d0e49ea8c1ed0d1a01e1082\"\u003e\u003c\/div\u003e\n\u003c\/div\u003e\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cstyle data-emotion-css=\"1n465md\"\u003e\u003c\/style\u003e\n\u003cimg src=\"https:\/\/cdn.builder.io\/api\/v1\/pixel?apiKey=48d1cdcd52ec4d289f1ef8c4f75da167\" aria-hidden=\"true\" alt=\"\" role=\"presentation\" width=\"0\" height=\"0\" class=\"builder-block builder-pixel-vx31p0civxe css-1n465md\" builder-id=\"builder-pixel-vx31p0civxe\"\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\u003c\/div\u003e\u003c\/div\u003e\u003c\/builder-component\u003e\n\u003cscript async src=\"https:\/\/cdn.builder.io\/js\/webcomponents\"\u003e\u003c\/script\u003e","brand":"Pass Labs","offers":[{"title":"Silver","offer_id":48491455250746,"sku":"HPA-1c-SL","price":4045.0,"currency_code":"USD","in_stock":true},{"title":"Black","offer_id":48491455283514,"sku":"HPA-1c-BL","price":4545.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0834\/0245\/7402\/files\/Pass-Labs-HPA-1c-Amp-Main-08_bd0b1d4a-ce32-4e40-b32d-9a0f1bbc9c12.jpg?v=1755802792","url":"https:\/\/www.moon-audio.pro\/products\/pass-labs-hpa-1-headphone-amp","provider":"Moon Audio","version":"1.0","type":"link"}