{"product_id":"adcom-gfa-5705-5-channel-amplifier","title":"Adcom GFA-5705 5 Channel Amplifier","description":"\u003cdiv class=\"elementor-column elementor-col-50 elementor-top-column elementor-element elementor-element-6ddb067d\" data-id=\"6ddb067d\" data-element_type=\"column\" data-e-type=\"column\"\u003e\n\u003cdiv class=\"elementor-widget-wrap elementor-element-populated\"\u003e\n\u003cdiv class=\"elementor-element elementor-element-5379df71 elementor-widget elementor-widget-heading\" data-id=\"5379df71\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\"\u003e\n\u003cdiv class=\"elementor-widget-container\"\u003e\n\u003ch1 class=\"elementor-heading-title elementor-size-default\"\u003eAdcom GFA-5705 5 Channel Stereo Power Amplifier\u003c\/h1\u003e\n\u003cp\u003e\u003cimg src=\"https:\/\/adcom.com\/wp-content\/uploads\/gfa-5705-slide1.jpg\"\u003e\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"elementor-element elementor-element-13152ae2 elementor-widget elementor-widget-heading\" data-id=\"13152ae2\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\"\u003e\n\u003cdiv class=\"elementor-widget-container\"\u003e\u003cspan class=\"elementor-heading-title elementor-size-medium\"\u003eThe GFA-5705 amplifier can drive a very broad range of loudspeakers, including those with very low impedances, at sustained, high-power levels, even when the impedances are highly reactive. Great care was taken to insure that the distortion in the amplifier would remain extremely low. This 5-channel power amplifier is ideal for home theater use.\u003c\/span\u003e\u003c\/div\u003e\n\u003cdiv class=\"elementor-widget-container\"\u003e\n\u003cdiv class=\"elementor-element elementor-element-2b3c253 elementor-widget elementor-widget-heading\" data-id=\"2b3c253\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\"\u003e\n\u003cdiv class=\"elementor-widget-container\"\u003e\n\u003ch2 class=\"elementor-heading-title elementor-size-xl\"\u003ePower\u003c\/h2\u003e\n\u003cp\u003e\u003cimg src=\"https:\/\/adcom.com\/wp-content\/uploads\/gfa-5705-slide5.jpg\"\u003e\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"elementor-element elementor-element-3c01040b elementor-widget elementor-widget-text-editor\" data-id=\"3c01040b\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\"\u003e\n\u003cdiv class=\"elementor-widget-container\"\u003e\n\u003cp\u003eThe power supply in the GFA-5705 5-channel amplifier has enormous reserve with an extremely large transformer feeding a storage bank of 30000uF per channel \u0026amp; total of 150,000uF of filter capacitance. The transformer itself was designed for extremely good regulation, insuring stable voltages regardless of the power demands from the amplifier. Its higher efficiency was insured by using a toroidal design.\u003c\/p\u003e\n\u003cp\u003e\u003cimg src=\"https:\/\/adcom.com\/wp-content\/uploads\/gfa-5705-slide6.jpg\"\u003e\u003c\/p\u003e\n\u003cdiv class=\"elementor-element elementor-element-443738ab elementor-widget elementor-widget-heading\" data-id=\"443738ab\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\"\u003e\n\u003cdiv class=\"elementor-widget-container\"\u003e\n\u003ch2 class=\"elementor-heading-title elementor-size-xl\"\u003e5-channel power amplifier\u003c\/h2\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"elementor-element elementor-element-43366034 elementor-widget elementor-widget-text-editor\" data-id=\"43366034\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\"\u003e\n\u003cdiv class=\"elementor-widget-container\"\u003e\n\u003cp\u003eGreat care has been taken by ADCOM to assure that your 5-channel power amplifier is as flawless in appearance as it is electronically. The front panel is a heavy- gauge, high-grade aluminum extrusion carefully finished and anodized for durability. The chassis, top cover and rear panel are of heavy-gauge steel, both painted and baked. If the front panel, top or sides should become dusty or fingerprinted, they can be cleaned with a Swifter and\/or a clean, soft, Lintless, microfiber cloth,slightly dampened with a very mild detergent solution or nonammonia glass cleaner.\u003c\/p\u003e\n\u003cp\u003e\u003cimg src=\"https:\/\/adcom.com\/wp-content\/uploads\/gfa-5705-slide7.jpg\"\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cem\u003eHome theater authority — all five channels, no compromise.\u003c\/em\u003e\u003c\/p\u003e\n\u003cp\u003eThe\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003eAdcom GFA-5705\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eis a high-performance 5-channel power amplifier engineered specifically for home theater systems that demand real power across every channel. Delivering\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003e200 watts per channel into 8 ohms\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003e— with all five channels driven simultaneously — the GFA-5705 brings the same high-current authority and low-distortion performance Adcom is known for to the full surround experience.\u003c\/p\u003e\n\u003cp\u003eThe GFA-5705 is built to drive a very broad range of loudspeakers, including those with very low impedances, at sustained high-power levels — even when impedances are highly reactive. Great care was taken to ensure distortion remains extremely low under these demanding conditions, making it one of the most capable 5-channel amplifiers available at its price point.\u003c\/p\u003e\n\u003cp\u003e\u003cimg src=\"https:\/\/adcom.com\/wp-content\/uploads\/gfa-5705-slide8.jpg\"\u003e\u003c\/p\u003e\n\u003ch3\u003eMassive Power Supply\u003c\/h3\u003e\n\u003cp\u003eAt the core of the GFA-5705 is a substantial power supply built around a high-efficiency\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003etoroidal transformer\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003e— chosen for superior regulation and minimal radiated noise. It feeds an enormous storage bank of\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003e30,000µF of filter capacitance per channel\u003c\/strong\u003e, totaling\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003e150,000µF across all five channels\u003c\/strong\u003e. This reserve ensures stable, unwavering voltage under any power demand — from quiet dialogue to full-range, multi-channel peaks — keeping every channel composed and in control.\u003c\/p\u003e\n\u003ch3\u003eBuilt to Last\u003c\/h3\u003e\n\u003cp\u003eThe GFA-5705 is as flawless in appearance as it is electronically. Its front panel is crafted from heavy-gauge anodized aluminum extrusion, while the chassis, top cover, and rear panel are heavy-gauge painted and baked steel. The result is a substantial, rack-ready amplifier that looks and feels like the serious piece of engineering it is.\u003c\/p\u003e\n\u003ch3\u003eKey Features\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e200W × 5 channels (8 ohms) \/ 300W × 5 channels (4 ohms)\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003e— all channels driven simultaneously\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e150,000µF total filter capacitance\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003e(30,000µF per channel) — massive power reserve for sustained, high-current delivery\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHigh-efficiency toroidal transformer\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003e— exceptional regulation, minimal noise and leakage inductance\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDrives low-impedance and reactive speaker loads\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003ewith stability and control\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDamping factor \u0026gt;300\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003e(20Hz–20kHz) — tight, authoritative bass across all channels\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUltra-wide power bandwidth\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003e— 5Hz to 100kHz (−3dB)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIdeal for home theater\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003e— purpose-built 5-channel design for surround sound systems\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDual voltage compatible\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003e— 120VAC \u0026amp; 230VAC \/ 50–60Hz\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHeavy-gauge anodized aluminum \u0026amp; baked steel chassis\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003e— rack-compatible, built for long-term reliability\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eTechnical Specifications\u003c\/h3\u003e\n\u003ctable border=\"1\" cellpadding=\"8\" cellspacing=\"0\"\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth\u003eSpecification\u003c\/th\u003e\n\u003cth\u003eValue\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eOutput Power – 8 Ohms\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e200W per channel × 5 (all channels driven)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eOutput Power – 4 Ohms\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e300W per channel × 5 (all channels driven)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eNumber of Channels\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e5\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eFrequency Response\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e10Hz – 20kHz, +0 \/ −0.25dB (1W into 8 ohms)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003ePower Bandwidth (−3dB)\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e5Hz – 100kHz\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eInput Impedance\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e22,000 ohms\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eInput Sensitivity\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e1.8V rms (200W into 8 ohms)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eDamping Factor\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e\u0026gt;300 (20Hz – 20kHz)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003ePower Supply Filter Capacitance\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e150,000µF total (30,000µF per channel)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003ePower Transformer\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eHigh-efficiency toroidal design\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003ePower\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e120VAC \u0026amp; 230VAC \/ 50–60Hz\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eMaximum Dimensions (H × W × D)\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e10.75\" × 19\" × 19.75\" (275 × 480 × 565 mm)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eWeight\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e81 lbs. (37 kg)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eShipping Weight\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e90 lbs. (41 kg)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eChassis\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eHeavy-gauge anodized aluminum front panel; painted \u0026amp; baked steel chassis\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\n\u003ch3\u003eWhat is the Adcom GFA-5705?\u003c\/h3\u003e\n\u003cp\u003eThe Adcom GFA-5705 is a 5-channel Class A\/B stereo power amplifier from Adcom, USA, rated at 200 watts per channel into 8 ohms and 300 watts per channel into 4 ohms with all channels driven simultaneously. It features a 150,000µF power supply, balanced XLR and unbalanced RCA inputs, and a damping factor exceeding 300, making it a purpose-built solution for high-performance home theater systems. The GFA-5705 is available at Vinyl Sound in Buffalo, NY as an authorized Adcom dealer.\u003c\/p\u003e\n\u003ch3\u003eHow does the Adcom GFA-5705 compare to the Emotiva XPA-5 Gen3, NAD CI 9 x 60 DSP, and Rotel RMB-1585 MKII?\u003c\/h3\u003e\n\u003cp\u003eThe Adcom GFA-5705 delivers more raw power per channel than all three competitors, rated at 200W into 8 ohms and 300W into 4 ohms with all channels driven. The Emotiva XPA-5 Gen3 offers 200W into 8 ohms but steps down significantly under load, while the NAD CI 9 x 60 DSP targets custom installation and distributed audio rather than dedicated home theater amplification. The Rotel RMB-1585 MKII delivers 200W x 5 but uses a combination of switching and linear power supply topology, whereas the GFA-5705 is a fully discrete linear Class A\/B design with a massive toroidal transformer and 150,000µF of filter capacitance — providing a larger energy reserve for sustained, high-current demands. Shoppers in Buffalo and Western New York can audition and purchase the GFA-5705 at Vinyl Sound.\u003c\/p\u003e\n\u003ch3\u003eCan the Adcom GFA-5705 drive low-impedance or difficult loudspeakers?\u003c\/h3\u003e\n\u003cp\u003eYes. The GFA-5705 was specifically engineered to drive loudspeakers with very low impedances and highly reactive loads at sustained high-power levels. Adcom used a computer model of a difficult reactive loudspeaker during development to verify performance into real-world loads — not just bench resistors — ensuring the amplifier delivers its full rated power where it counts. Its damping factor above 300 further ensures precise woofer control across all five channels simultaneously.\u003c\/p\u003e\n\u003ch3\u003eWhat is Class A\/B amplifier topology and why does it matter?\u003c\/h3\u003e\n\u003cp\u003eClass A\/B is a well-established amplifier design that combines the sonic benefits of Class A operation at low signal levels — where both output devices remain active simultaneously — with the greater efficiency of Class B at higher output levels. The result is an amplifier that offers low distortion and natural sound quality without the excessive heat and power consumption of pure Class A designs. In the GFA-5705, Class A\/B topology is paired with a massive linear power supply, giving it both sonic refinement and the muscle to handle demanding 5-channel home theater loads continuously.\u003c\/p\u003e\n\u003ch3\u003eDoes the Adcom GFA-5705 have balanced XLR inputs?\u003c\/h3\u003e\n\u003cp\u003eYes. The GFA-5705 provides both balanced XLR and unbalanced RCA inputs on every channel, giving you full compatibility with virtually any AV processor or surround sound preamplifier. Balanced connections are particularly useful in home theater installations where longer cable runs between the processor and amplifier are common, as they reject induced noise and hum more effectively than single-ended RCA connections.\u003c\/p\u003e\n\u003ch3\u003eWhat AV processors pair well with the Adcom GFA-5705?\u003c\/h3\u003e\n\u003cp\u003eThe GFA-5705 pairs naturally with any AV processor or surround preamp offering balanced XLR or unbalanced RCA outputs across five channels. Excellent pairing options include the Adcom GTP-600 preamplifier-processor, the NAD T 778 AV receiver used as a preamp-out source, and the Anthem AVM 90 processor for audiophile-grade home theater applications. With its 22,000-ohm input impedance and 1.8V RMS input sensitivity, the GFA-5705 is compatible with virtually all professional and consumer-grade surround processors available today.\u003c\/p\u003e\n\u003ch3\u003eIs the Adcom GFA-5705 rack-mountable?\u003c\/h3\u003e\n\u003cp\u003eThe GFA-5705 features a standard 19-inch wide front panel, making it compatible with professional audio rack enclosures. At 10.75 inches tall and weighing 81 lbs., it requires a sturdy rack shelf rather than ear-mount brackets for proper support. Its dimensions of 10.75\" x 19\" x 19.75\" should be confirmed against your rack depth before installation, as the 19.75-inch depth requires a deeper-than-standard rack.\u003c\/p\u003e\n\u003ch3\u003eWhere can I buy the Adcom GFA-5705 in Buffalo or Western New York?\u003c\/h3\u003e\n\u003cp\u003eThe Adcom GFA-5705 is available at Vinyl Sound, an authorized Adcom dealer located in Buffalo, NY. Vinyl Sound serves the greater Western New York and Buffalo metro area, offering expert guidance on home theater amplification, speaker pairing, and system integration. Visit vinylsound.com or stop in to experience the GFA-5705 firsthand.\u003c\/p\u003e\n\u003cp\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e","brand":"Adcom","offers":[{"title":"Default Title","offer_id":53192955593011,"sku":"GFA-5705","price":3999.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0873\/0293\/0739\/files\/AdcomGFA-585seStereoPowerAmplifier_1_ddc7e4cc-a2fd-4d80-9665-fa83147658e1.png?v=1775100047","url":"https:\/\/vinylsound.com\/products\/adcom-gfa-5705-5-channel-amplifier","provider":"Vinyl Sound USA","version":"1.0","type":"link"}