{"product_id":"topping-a90-headphone-amp-original","title":"TOPPING A90 Headphone Amp","description":"\u003cp\u003e\u003cem\u003e\u003cspan style=\"font-weight: 400;\"\u003e\u003cmeta charset=\"utf-8\"\u003e \u003cstrong\u003eNote: This product is discounted because of being part of Apos' Inventory Clearance drive and is final sale.\u003c\/strong\u003e\u003c\/span\u003e\u003c\/em\u003e\u003c\/p\u003e\n \u003ch1\u003e\u003cb\u003eOur best-selling amplifier \u003c\/b\u003e\u003c\/h1\u003e\n \u003cp\u003e\u003cspan style=\"font-weight: 400;\"\u003e“Mr. Clean.” “The Giant Killer.” “The Best Amp Ever.” These are a few of nicknames the TOPPING A90, our best-selling amplifier, has gained since its release. At its most basic level, it’s a balanced amp and pre-amp with tremendously clean and powerful output. At its broadest level, it’s become the benchmark by which all other solid state amplifiers below $1,000 are judged.\u003c\/span\u003e\u003c\/p\u003e\n \u003ch2\u003e\u003cb\u003eD for Discrete\u003c\/b\u003e\u003c\/h2\u003e\n \u003cp\u003e\u003cspan style=\"font-weight: 400;\"\u003eThe A90 Discrete, or A90D, is an upgraded version of the groundbreaking A90. As its name suggests, the A90D uses fully discrete components in a complete redesign of the A90 NFCA module. Four discrete NFCA modules using 39 transistors each form the fully balanced amp architecture. The matched precision transistors ensure unparalleled distortion and noise performance. \u003c\/span\u003e\u003c\/p\u003e\n \u003ch2\u003e\u003cb\u003eA90 Discrete vs A90\u003c\/b\u003e\u003c\/h2\u003e\n \u003cp\u003e\u003cspan style=\"font-weight: 400;\"\u003eBesides featuring fully discrete NFCA modules, the A90D features a number of quality-of-life improvements that are lacking in the A90. These include an R2R volume relay, a remote control, a ground loop noise terminator switch, a 12V trigger interface, a redesigned UI, volume memorization, and more. The specs of the A90D are also slightly better. For a complete breakdown of the differences between these models,\u003ca href=\"https:\/\/apos.audio\/blogs\/news\/topping-a90-vs-topping-a90d-comparison-chart\" target=\"_blank\"\u003e \u003c\/a\u003e\u003c\/span\u003e\u003ca href=\"https:\/\/apos.audio\/blogs\/news\/topping-a90-vs-topping-a90d-comparison-chart\" target=\"_blank\"\u003echeck out this comparison chart. \u003c\/a\u003e\u003c\/p\u003e\n \u003ch2\u003e\u003cb\u003eCalling all cans\u003c\/b\u003e\u003c\/h2\u003e\n \u003cp\u003e\u003cspan style=\"font-weight: 400;\"\u003ePlanar magnetic, electrostatic, dynamic drivers, IEMs—pick your poison, the A90D can handle it. Thanks to its high output voltage, high output current, and low output impedance, the A90D can push loads of power into high-impedance full-sized headphones or pare that power back in order to drive sensitive IEMs. And with an ultra-low noise rating and high dynamic range, the A90D does it all without producing any audible noise. \u003c\/span\u003e\u003c\/p\u003e\n \u003ch2\u003e\u003cb\u003eSay goodbye to ground loop noise\u003c\/b\u003e\u003c\/h2\u003e\n \u003cp\u003e\u003cspan style=\"font-weight: 400;\"\u003eWhen multiple pieces of equipment are used in conjunction, ground loop noise can occur. Ground loop noise most often manifests as a buzzing or humming sound, which is capable of being loud enough to damage speakers. Although it's known to happen most often in single-ended feeds, it can happen in balanced feeds, too.\u003cbr\u003e\u003c\/span\u003e\u003c\/p\u003e\n \u003cp\u003e\u003cspan style=\"font-weight: 400;\"\u003eThe A90D solves this issue with a GND\/LIFT switch. When in normal use, set the switch to GND. If you encounter ground loop noise, set the switch to LIFT, which will change the ground point of the A90D from its chassis to the equipment it’s connected to, eliminating the noise. \u003c\/span\u003e\u003c\/p\u003e\n \u003ch2\u003e\u003cb\u003ePre-amp mode\u003c\/b\u003e\u003c\/h2\u003e\n \u003cp\u003e\u003cspan style=\"font-weight: 400;\"\u003eWith the A90D in pre-amp mode, connect a power amplifier to drive bookshelf, desktop, or floor speakers. You can also connect the A90D to the D90SE\/LE DAC in pre-amp mode to create a complete high-end sound system. And with the included remote control, you can control it all from the comfort of your couch. \u003c\/span\u003e\u003c\/p\u003e\n \u003ch2\u003e\u003cb\u003e12V trigger\u003c\/b\u003e\u003c\/h2\u003e\n \u003cp\u003e\u003cspan style=\"font-weight: 400;\"\u003eWouldn’t it be nice if every time you turned on the A90D, the TOPPING LA90 came on automatically, or vice versa? That’s possible thanks to the A90D’s 12V trigger interface. Set it to active (trigger out) or passive (trigger in), and it can be turned on and off synchronously with other devices equipped with a 12V trigger interface. \u003c\/span\u003e\u003c\/p\u003e\n \u003ch2\u003e\u003cb\u003eR2R volume control\u003c\/b\u003e\u003c\/h2\u003e\n \u003cp\u003e\u003cspan style=\"font-weight: 400;\"\u003eThe A90D uses an R2R volume control composed of relays and resistor networks, bringing the advantages of precise control, longevity, and complete channel balance. \u003c\/span\u003e\u003c\/p\u003e\n \u003ch2\u003e\u003cb\u003eVolume memorization\u003c\/b\u003e\u003c\/h2\u003e\n \u003cp\u003e\u003cspan style=\"font-weight: 400;\"\u003eSet the A90D to memorize the output volume settings of the pre-amp, headphone amp, and PRE+HPA modes, and automatically restore to the last volume used when the same output is selected in the future. \u003c\/span\u003e\u003c\/p\u003e\n \u003ch3\u003e\u003cb\u003eA90D Product highlights\u003c\/b\u003e\u003c\/h3\u003e\n \u003cul\u003e\n \u003cli style=\"font-weight: 400;\"\u003e\u003cspan style=\"font-weight: 400;\"\u003eHeadamp\/pre-amp\u003c\/span\u003e\u003c\/li\u003e\n \u003cli style=\"font-weight: 400;\"\u003e\u003cspan style=\"font-weight: 400;\"\u003eNFCA discrete modules\u003c\/span\u003e\u003c\/li\u003e\n \u003cli style=\"font-weight: 400;\"\u003e\u003cspan style=\"font-weight: 400;\"\u003e9800mW x2 output power\u003c\/span\u003e\u003c\/li\u003e\n \u003cli style=\"font-weight: 400;\"\u003e\u003cspan style=\"font-weight: 400;\"\u003eOutputs: 4-pin XLR, 4.4 balanced, 6.35mm SE\u003c\/span\u003e\u003c\/li\u003e\n \u003cli style=\"font-weight: 400;\"\u003e\u003cspan style=\"font-weight: 400;\"\u003eR2R relay volume control\u003c\/span\u003e\u003c\/li\u003e\n \u003cli style=\"font-weight: 400;\"\u003e\u003cspan style=\"font-weight: 400;\"\u003eGround loop noise terminator\u003c\/span\u003e\u003c\/li\u003e\n \u003cli style=\"font-weight: 400;\"\u003e\u003cspan style=\"font-weight: 400;\"\u003e12V trigger interface\u003c\/span\u003e\u003c\/li\u003e\n \u003cli style=\"font-weight: 400;\"\u003e\u003cspan style=\"font-weight: 400;\"\u003e2 gain settings\u003c\/span\u003e\u003c\/li\u003e\n \u003cli style=\"font-weight: 400;\"\u003e\u003cspan style=\"font-weight: 400;\"\u003e\u0026lt;0.000055% THD+N\u003c\/span\u003e\u003c\/li\u003e\n \u003cli style=\"font-weight: 400;\"\u003e\u003cspan style=\"font-weight: 400;\"\u003e145dB DNR\u003c\/span\u003e\u003c\/li\u003e\n \u003c\/ul\u003e\n \u003ch3\u003e\u003cb\u003eSpecs\u003c\/b\u003e\u003c\/h3\u003e\n \u003cp\u003e\u003cspan style=\"font-weight: 400;\"\u003eSee images\u003c\/span\u003e\u003c\/p\u003e\n \u003ch3\u003e\u003cb\u003eWhat’s included\u003c\/b\u003e\u003c\/h3\u003e\n \u003cp\u003e\u003cspan\u003eA90D\u003c\/span\u003e\u003cbr\u003e\u003c\/p\u003e\n \u003cul\u003e\n \u003cli style=\"font-weight: 400;\"\u003e\u003cspan style=\"font-weight: 400;\"\u003eA90D Headphone Amplifier\u003c\/span\u003e\u003c\/li\u003e\n \u003cli style=\"font-weight: 400;\"\u003e\u003cspan style=\"font-weight: 400;\"\u003eRemote control\u003c\/span\u003e\u003c\/li\u003e\n \u003cli style=\"font-weight: 400;\"\u003e\u003cspan style=\"font-weight: 400;\"\u003eAC cable\u003c\/span\u003e\u003c\/li\u003e\n \u003cli style=\"font-weight: 400;\"\u003e\u003cspan style=\"font-weight: 400;\"\u003e6.35mm to 3.5mm adapter\u003c\/span\u003e\u003c\/li\u003e\n \u003cli style=\"font-weight: 400;\"\u003e\u003cspan style=\"font-weight: 400;\"\u003eUser manual\u003c\/span\u003e\u003c\/li\u003e\n \u003cli style=\"font-weight: 400;\"\u003e\u003cspan style=\"font-weight: 400;\"\u003eWarranty card\u003c\/span\u003e\u003c\/li\u003e\n \u003c\/ul\u003e\n \u003cp\u003e\u003cspan style=\"font-weight: 400;\"\u003eA90\u003c\/span\u003e\u003c\/p\u003e\n \u003cul\u003e\n \u003cli\u003e\u003cspan style=\"font-weight: 400;\"\u003eA90 Headphone Amplifier\u003c\/span\u003e\u003c\/li\u003e\n \u003cli\u003e\u003cspan style=\"font-weight: 400;\"\u003eAC cable\u003c\/span\u003e\u003c\/li\u003e\n \u003cli\u003e\u003cspan style=\"font-weight: 400;\"\u003e6.35mm to 3.5mm adapter\u003c\/span\u003e\u003c\/li\u003e\n \u003cli\u003e\u003cspan style=\"font-weight: 400;\"\u003eUser manual\u003c\/span\u003e\u003c\/li\u003e\n \u003cli\u003e\u003cspan style=\"font-weight: 400;\"\u003eWarranty card\u003c\/span\u003e\u003c\/li\u003e\n \u003c\/ul\u003e\n \u003cul\u003e\n \u003cli style=\"font-weight: 400;\"\u003e\u003cspan style=\"font-weight: 400;\"\u003eA90D Headphone Amplifier\u003c\/span\u003e\u003c\/li\u003e\n \u003cli style=\"font-weight: 400;\"\u003e\u003cspan style=\"font-weight: 400;\"\u003eRemote control\u003c\/span\u003e\u003c\/li\u003e\n \u003cli style=\"font-weight: 400;\"\u003e\u003cspan style=\"font-weight: 400;\"\u003eAC cable\u003c\/span\u003e\u003c\/li\u003e\n \u003cli style=\"font-weight: 400;\"\u003e\u003cspan style=\"font-weight: 400;\"\u003e6.35mm to 3.5mm adapter\u003c\/span\u003e\u003c\/li\u003e\n \u003cli style=\"font-weight: 400;\"\u003e\u003cspan style=\"font-weight: 400;\"\u003eUser manual\u003c\/span\u003e\u003c\/li\u003e\n \u003cli style=\"font-weight: 400;\"\u003e\u003cspan style=\"font-weight: 400;\"\u003eWarranty card\u003c\/span\u003e\u003c\/li\u003e\n \u003c\/ul\u003e\n \u003ch3\u003e\u003cb\u003eWhat pairs well\u003c\/b\u003e\u003c\/h3\u003e\n \u003cul\u003e\n \u003cli style=\"font-weight: 400;\"\u003e\u003ca href=\"https:\/\/apos.audio\/products\/topping-d90se-dac?_pos=1\u0026amp;_sid=9ef54788a\u0026amp;_ss=r\u0026amp;variant=40005025104043\"\u003e\u003cspan style=\"font-weight: 400;\"\u003eTOPPING D90SE\/LE DAC\u003c\/span\u003e\u003c\/a\u003e\u003c\/li\u003e\n \u003cli style=\"font-weight: 400;\"\u003e\u003ca href=\"https:\/\/apos.audio\/products\/topping-la90-power-amp?_pos=1\u0026amp;_sid=aa81f45ca\u0026amp;_ss=r\"\u003e\u003cspan style=\"font-weight: 400;\"\u003eTOPPING LA90 Class AB Power Amplifier\u003c\/span\u003e\u003c\/a\u003e\u003c\/li\u003e\n \u003cli style=\"font-weight: 400;\"\u003e\u003ca href=\"https:\/\/apos.audio\/products\/apos-flow-balanced-xlr-cable?_pos=1\u0026amp;_sid=59afb00fb\u0026amp;_ss=r\" rel=\"noopener noreferrer\" target=\"_blank\"\u003e\u003cspan style=\"font-weight: 400;\"\u003eApos Flow Balanced XLR Cable\u003c\/span\u003e\u003c\/a\u003e\u003c\/li\u003e\n \u003cli style=\"font-weight: 400;\"\u003e\u003ca href=\"https:\/\/apos.audio\/products\/topping-sr2-aluminum-rack?_pos=1\u0026amp;_sid=24ed66206\u0026amp;_ss=r\" rel=\"noopener noreferrer\" target=\"_blank\"\u003e\u003cspan style=\"font-weight: 400;\"\u003eTOPPING SR2 Aluminum Rack\u003c\/span\u003e\u003c\/a\u003e\u003c\/li\u003e\n \u003c\/ul\u003e\n \u003cul\u003e\u003c\/ul\u003e\n \u003ch3\u003e\u003cstrong\u003eFeatured Reviews\u003c\/strong\u003e\u003c\/h3\u003e\n \u003cp\u003e\u003ciframe height=\"315\" width=\"560\" src=\"https:\/\/www.youtube.com\/embed\/gnPXVNUG9nk\" title=\"YouTube video player\"\u003e\u003c\/iframe\u003e\u003c\/p\u003e\n \u003cp\u003e\u003cem\u003e\"Probably the best sound signature of any amplifier I've heard to date.\" -Joshua Valour\u003c\/em\u003e\u003c\/p\u003e\n \u003cp\u003e\u003ciframe height=\"315\" width=\"560\" title=\"YouTube video player\" src=\"https:\/\/www.youtube.com\/embed\/5nsYR-8zjQY\"\u003e\u003c\/iframe\u003e\u003c\/p\u003e\n \u003cp\u003e\u003cem\u003e\"I'm pretty sure the textbook hasn't been written yet. But if it has, only TOPPING has a copy of it.\" -Zeos Pantera\u003c\/em\u003e\u003cbr\u003e\u003c\/p\u003e\n \u003cp\u003e\u003cbr\u003e\u003ciframe height=\"315\" width=\"560\" src=\"https:\/\/www.youtube.com\/embed\/Nh9jI9NW2Cc\" title=\"YouTube video player\"\u003e\u003c\/iframe\u003e\u003c\/p\u003e\n \u003cp\u003e\u003cem\u003e\"This is the perfect amp for anyone wanting to get a completely dead-neutral reference sort of amplification.\" -DMS\u003c\/em\u003e\u003cspan style=\"font-size: 10pt; font-family: Arial; font-style: normal;\" data-sheets-value='{\"1\":2,\"2\":\"\\\"This is the perfect amp for anyone wanting to get a completely dead-neutral reference sort of amplification.\\\"\"}' data-sheets-userformat='{\"2\":513,\"3\":{\"1\":0},\"12\":0}'\u003e\u003cbr\u003e\u003c\/span\u003e\u003c\/p\u003e\n \u003cp\u003e\u003ciframe height=\"315\" width=\"560\" title=\"YouTube video player\" src=\"https:\/\/www.youtube.com\/embed\/e0BEt1-qg0M\"\u003e\u003c\/iframe\u003e\u003c\/p\u003e\n \u003cp\u003e\u003cem\u003e\"This is the best test bench amplifier that I've run across so far.\" -Joshua Valour\u003c\/em\u003e\u003cspan data-sheets-userformat='{\"2\":513,\"3\":{\"1\":0},\"12\":0}' data-sheets-value=\"{\u0026quot;1\u0026quot;:2,\u0026quot;2\u0026quot;:\u0026quot;\\\u0026quot;This is the best test bench amplifier that I've run across so far.\\\u0026quot;\u0026quot;}\" style=\"font-size: 10pt; font-family: Arial; font-style: normal;\"\u003e\u003cbr\u003e\u003c\/span\u003e\u003c\/p\u003e\n \u003cp\u003e\u003ciframe height=\"315\" width=\"560\" src=\"https:\/\/www.youtube.com\/embed\/zUWVL2rxwAQ\" title=\"YouTube video player\"\u003e\u003c\/iframe\u003e\u003c\/p\u003e\n \u003cp\u003e\u003cem\u003e\"How good's the TOPPING A90? F*****g good. F*****g real good.\" -Z Reviews\u003c\/em\u003e\u003c\/p\u003e\n \u003cp\u003e\u003ciframe height=\"315\" width=\"560\" src=\"https:\/\/www.youtube.com\/embed\/J6985UD__1M\" title=\"YouTube video player\"\u003e\u003c\/iframe\u003e\u003c\/p\u003e\n \u003cp\u003e\u003cem\u003e\"Fully deserves my highest praise.\" -SoundNews\u003c\/em\u003e\u003c\/p\u003e\n \u003cp\u003e\u003ciframe height=\"315\" width=\"560\" title=\"YouTube video player\" src=\"https:\/\/www.youtube.com\/embed\/54p0GbYCZBk\"\u003e\u003c\/iframe\u003e\u003c\/p\u003e\n \u003cp\u003e\u003cem\u003e\"The best headphone amp I've had the pleasure of listening to.\" -The Boomer Consumer\u003c\/em\u003e\u003c\/p\u003e\n \u003cp\u003e\u003ciframe height=\"315\" width=\"560\" src=\"https:\/\/www.youtube.com\/embed\/SH6FNIK9_08\" title=\"YouTube video player\"\u003e\u003c\/iframe\u003e\u003c\/p\u003e\n \u003cp\u003e\u003cem\u003e\"For $600, you can't go wrong.\" -the Honest Audiophile\u003c\/em\u003e\u003c\/p\u003e","brand":"TOPPING","offers":[{"title":"[Black] A90 \/ Headphone Amp Only","offer_id":46866226217135,"sku":"APS-0257-01","price":499.0,"currency_code":"USD","in_stock":true},{"title":"[Silver] A90 \/ Headphone Amp Only","offer_id":46866226249903,"sku":"APS-0257-02","price":340.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0734\/6415\/2239\/files\/apos-audio-topping-headphone-amp-topping-a90-discrete-a90-headphone-amp-37219483517164.jpg?v=1777716420","url":"https:\/\/freshized.com\/products\/topping-a90-headphone-amp-original","provider":"Freshized","version":"1.0","type":"link"}