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12 CARING FOR YOUR GFA-7805/7807 Great care has been taken by ADCOM to ensure that your 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 heavy-gauge steel that has been powder coated and baked to ensure a lasting finish. If the front panel, top or sides become dusty or fingerprinted, they can be cleaned with a soft lint-free cloth, slightly dampened with a very mild detergent solution or glass cleaner. Do not spray or pour liquids of any kind directly onto the GFA-7805/7807. SERVICING ADCOM has a Technical Service Department to answer questions pertinent to the installation and operation of your unit. In the event of difficulty, please contact us for prompt advice. If your problem cannot be resolved through our combined efforts, we may refer you to an authorized repair agency, or authorize return of the unit to our factory. To aid us in directing you to a convenient service center, it would be helpful if you indicate which major city is accessible to your home. Please address mail inquires to: Phone, Fax or Email inquires to: ADCOM Service Voice: (480) 607-2277 8551 East Anderson Drive, Suite 105 Fax: (480) 348-9876 Scottsdale, Arizona 85255 USA Monday through Friday 9:00 AM to 5:00 PM MST Email: service@adcom.com For Fax inquires, please include a return Fax number for the reply. When calling or writing about your GFA-7805/7807, be sure to note and refer to its serial number as well as the date of purchase and the dealer from whom it was purchased. In any communications to us, please include a daytime phone number where we may reach you. In the event the unit must be returned to our factory for service, you will be instructed on the proper procedure when you call or write for a Return Authorization. UNDER NO CIRCUMSTANCES SHOULD YOUR UNIT BE SHIPPED TO OUR FACTORY WITHOUT PRIOR AUTHORIZATION, OR PACKED IN OTHER THAN ITS ORIGINAL CARTON AND FILLERS. If the original shipping carton and its fillers have been lost, discarded, or damaged, a duplicate carton may be obtained from our Service Department for a nominal charge. Always ship PREPAID VIA UNITED PARCEL SERVICE (UPS) OR OTHER APPROVED CARRIER. DO NOT SHIP VIA PARCEL POST, since the packing was not designed to withstand rough Parcel Post handling. FREIGHT COLLECT SHIPMENTS WILL NOT BE ACCEPTED UNDER ANY CIRCUMSTANCES. 13 GFA-7805 SPECIFICATIONS Power Rating (To EIA/CEA-490-A Requirements) 300 Watts continuous average power per channel into 8 ohms at any frequency between 20Hz and 20kHz with all channels driven at less than 1.00% THD. 450 Watts continuous average power per channel into 4 ohms at any frequency between 20Hz and 20khz with all channels driven at less than 1.00% THD. THD + Noise at 300 watts into 8 Ohms (Typical) 20Hz................................................................................ 0.012% 1kHz................................................................................ 0.135% 10kHz................................................................................ 0.12% 20kHz................................................................................ 0.12% THD + Noise at 450 watts into 4 Ohms (Typical) 20Hz.................................................................................. 0.3% 1 kHz................................................................................. 0.3% 10kHz................................................................................ 0.27% 20kHz................................................................................. 0.1% Frequency Response @ 1 Watt into 8 Ohms 10Hz to 20kHz..................................................................... +0, -0.25dB Power Bandwidth (-3d B)........................................................... 3Hz to 130kHz Dynamic Headroom Into 4 Ohms........................................................... 0.96 dB Signal to Noise Ratio, “A” Weighted 300 watts into 8 ohms.................................................................. . 112dB Gain................................................................................. 29.67dB Input Sensitivity for 1 Watt output..................................................................... 0.1 volts for 300 Watts output................................................................. 1.61 volts Input Impedance Unbalanced........................................................................ 500K ohms Balanced........................................................................... 10K ohms Damping Factor 1k................................................................................... > 500 General Power (available in 230VAC by special order).......................................... 120VAC—50/6OHz Chassis Dimension................................... 193/4” (501.65mm) x 17” (432mm) x 83/4” (222.25mm) Maximum Dimensions...................