\u201cMr. Clean.\u201d \u201cThe Giant Killer.\u201d \u201cThe Best Amp Ever.\u201d These are a few of nicknames the TOPPING A90, our best-selling amplifier, has gained since its release. At its most basic level, it\u2019s a balanced amp and pre-amp with tremendously clean and powerful output. At its broadest level, it\u2019s become the benchmark by which all other solid state amplifiers below $1,000 are judged.<\/span><\/p>\n The 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.\u00a0<\/span><\/p>\n When 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. The 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\u2019s connected to, eliminating the noise.\u00a0<\/span><\/p>\n With 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.\u00a0<\/span><\/p>\n Wouldn\u2019t it be nice if every time you turned on the A90D, the TOPPING LA90 came on automatically, or vice versa? That\u2019s possible thanks to the A90D\u2019s 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.\u00a0<\/span><\/p>\n The A90D uses an R2R volume control composed of relays and resistor networks, bringing the advantages of precise control, longevity, and complete channel balance.\u00a0<\/span><\/p>\n Our best-selling amplifier\u00a0 \u201cMr. Clean.\u201d \u201cThe Giant Killer.\u201d \u201cThe Best Amp Ever.\u201d These are a few of nicknames the TOPPING…<\/p>","protected":false},"featured_media":7872,"comment_status":"open","ping_status":"closed","template":"","meta":[],"etheme_brands":[{"term_id":214,"name":"Topping","slug":"topping","term_group":0,"term_taxonomy_id":214,"taxonomy":"brand","description":"","parent":0,"count":4,"filter":"raw"}],"product_brand":[],"product_cat":[206,54],"product_tag":[183],"class_list":{"0":"post-7068","1":"product","2":"type-product","3":"status-publish","4":"has-post-thumbnail","6":"brand-topping","7":"product_cat-dac-amplifier","8":"product_cat-desktop-dac-amps","9":"product_tag-amp","11":"first","12":"instock","13":"shipping-taxable","14":"purchasable","15":"product-type-variable"},"yoast_head":"\nD for Discrete<\/b><\/h4>\n
Say goodbye to ground loop noise<\/b><\/h4>\n
\n<\/span><\/p>\nPre-amp mode<\/b><\/h4>\n
12V trigger<\/b><\/h4>\n
R2R volume control<\/b><\/h4>\n
A90D Product highlights<\/b><\/h4>\n
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