{"product_id":"adualytic-hp70-fully-balanced-discrete-headphone-amplifier","title":"Audalytic HP70 Fully-Balanced Discrete Headphone Amplifier","description":"\u003ch1\u003e\u003cstrong\u003eDiscrete Class A headphone amp and preamp\u003c\/strong\u003e\u003c\/h1\u003e\n\u003cp\u003eThe AUDALYTIC HP70 is a desktop headphone amplifier built around a fully-balanced discrete Class-A design, four pairs of power MOSFETs, R2R relay volume control, and flexible preamp operation. With 4.4mm balanced and 6.35mm single-ended headphone outputs, XLR and RCA inputs, XLR and RCA preamp outputs, adjustable gain, and remote control support, it gives headphone listeners and desktop speaker users a serious analog control center without turning your desk into a mess. \u003c\/p\u003e\n\u003ch2\u003e\u003cstrong\u003eClass-A amplification with discrete control\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cp\u003eThe HP70 uses a fully-balanced discrete Class-A amplifier circuit with four pairs of power MOSFETs for tons of driving power for demanding headphones. A discrete design uses individual circuit components instead of relying on a single integrated amplifier chip.\u003c\/p\u003e\n\u003ch2\u003e\u003cstrong\u003eBalanced performance from more than balanced inputs\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cp\u003eThe HP70’s input stage uses a fully-balanced topology, with single-ended to balanced conversion for RCA sources. That means you can connect a standard RCA source and still benefit from the amplifier’s balanced internal signal path. \u003c\/p\u003e\n\u003ch2\u003e\u003cstrong\u003eRelay volume control for four-channel precision\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cp\u003eThe R-2R relay volume system provides precise level adjustment while maintaining consistent channel matching across all four paths. This matters most at lower listening levels, where small left-right imbalances can become noticeable. Instead of relying on a basic analog pot, the HP70 uses a relay-based approach designed for cleaner, more stable volume steps.\u003c\/p\u003e\n\u003ch2\u003e\u003cstrong\u003ePreamp mode for speakers and headphones\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cp\u003eThe HP70 can work as a dedicated pure preamplifier by disabling the post-amplification stage. It includes two socketed LME49720 dual op-amps in the preamp section and switchable preamp output for moving between headphone and speaker use. Keep it at the center of a desk system, then send signal to powered speakers or a power amp when you're not using headphones.\u003c\/p\u003e\n\u003ch2\u003e\u003cstrong\u003ePower supply designed to keep noise down\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cp\u003eA built-in 30VA low-noise power supply gives the HP70 stable internal power, while support for external 15–18V DC input adds another option for users who want to pair it with a separate supply. Multiple independent voltage regulation circuits help reduce ripple noise and interference, keeping the amplifier section focused on the audio signal rather than electrical clutter.\u003c\/p\u003e\n\u003ch2\u003e\u003cstrong\u003eFront-panel control without the clutter\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cp\u003eThe front panel keeps daily use simple with touch standby, a display, a central volume and setting knob, a 4.4mm balanced headphone output, and a 6.35mm single-ended headphone output.\u003c\/p\u003e\n\u003ch2\u003e\u003cstrong\u003eRear-panel connections for a full desktop system\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cp\u003eThe HP70 includes balanced XLR left and right inputs, two sets of single-ended RCA inputs, single-ended RCA outputs, balanced XLR outputs, DC 15–18V input, power input, and fuse access.\u003cstrong\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003ch3\u003e\u003cstrong\u003eProduct highlights\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eFully balanced discrete Class A headphone amplifier\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eFour pairs of power MOSFETs for strong headphone drive\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eR2R relay volume control with 4-channel matching\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eSingle-ended to balanced conversion for RCA inputs\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003ePure preamp operation with post-amplification disable option\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eTwo socketed LME49720 dual op-amps in the preamp stage\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eBuilt-in 30VA low-noise power supply\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eExternal 15–18V DC input support\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eMultiple independent voltage regulation circuits\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eAdjustable gain from 0 to 28dB\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eRemote control support\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003e4.4mm balanced and 6.35mm single-ended headphone outputs\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eThree line inputs and two preamp outputs\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003e\u003cstrong\u003eSpecs\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eProduct type: Fully balanced discrete headphone amplifier\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eAmplifier design: Fully balanced discrete Class A\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003ePower devices: 4 pairs of power MOSFETs\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003ePreamp op-amps: Dual socketed LME49720\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eVolume control: R-2R relay volume control\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eGain adjustment: 0 to 28dB\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eHeadphone outputs: 4.4mm balanced, 6.35mm single-ended\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eInputs: Balanced XLR left and right, single-ended RCA L1\/R1, single-ended RCA L2\/R2\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003ePreamp outputs: Balanced XLR left and right, single-ended RCA left and right\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003ePower supply: Built-in 30VA low-noise power supply\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eExternal DC input: 15–18V DC\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eDimensions: 8.66 in. × 6.69 in. × 1.97 in. (220mm × 170mm × 50mm)\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eRemote control: Supported\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003e\u003cstrong\u003eWhat’s included\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eAUDALYTIC HP70 fully balanced discrete headphone amplifier\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Audalytic","offers":[{"title":"Black","offer_id":47653431541996,"sku":"APS-1326-1","price":349.0,"currency_code":"USD","in_stock":true},{"title":"Silver","offer_id":47653431574764,"sku":"APS-1326-2","price":349.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0225\/2721\/3642\/files\/apos-audio-audalytic-headphone-amp-adualytic-hp70-fully-balanced-discrete-headphone-amplifier-1237248590.png?v=1778275269","url":"https:\/\/apos.audio\/products\/adualytic-hp70-fully-balanced-discrete-headphone-amplifier","provider":"Apos","version":"1.0","type":"link"}