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Adcom 7705 manual

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Table of contents for the manual

  • Page 1

    GF A-7705 & GF A-7707 S.A.F .E. ® HIGH CURRENT , MUL TI-CHANNEL POWER AMPLIFIERS[...]

  • Page 2

    [...]

  • Page 3

    • Precision-matched dev ices used throughout the signal path. • Independent power supplies for each channel. • F ewer gain stages improve signal reproduction accur acy . • Custom toroidal power tr ansformer prov ides better regulation and greater peak current capability . • ADCOM-Universal pre-prepped chassis and internal power supplies f[...]

  • Page 4

    Introduction Congratulations on your decision to purchase the GF A-7705/07 multi-channel power ampli er . The GF A-7705/ 07 integrates very well with any other home theater system, such as Dolby P roLogic ™ or Dolby Digital ™ or Dolby Digital ™ ™ . Y ou have made a wise choice that will reward you with exceptionally accurate and musical [...]

  • Page 5

    Rear P anel Inputs (1) The audio inputs for the GF A-7705 and 7707 are through high-quality , gold-plated RCA jacks to minimize high- frequency losses, noise, etc. They will accept standard RCA-type plugs, one for each of the  ve channels; Front L (Left), Center , Front R (Right), Surround L (Left), and Surround R (Right). T o insure that the pe[...]

  • Page 6

    6 W ARNING THERE ARE NO USER-SER VICEABLE P AR TS OR FUSES INSIDE THE GF A-7705/07. In the event that the ampli er ’ s rear-panel circuit breaker fails to reset (opens again when power applied to unit and unit turned on) you must refer the ampli er to ADCOM Factory Service or ADCOM Authorized Service Center . turned on) you must refer the a[...]

  • Page 7

    Front P anel On/Off Switch (5) The On/Off Switch controls power to the power transformer and circuits of the GF A-7705/07. Whenever the GF A-7705/07 is energized the P ower LED (7) will glow . T o turn the GF A-7705/07 on, press the push-button. It will remain in the “engaged” position while the unit is energized. T o turn the GF A-7705/07 off,[...]

  • Page 8

    8 Distortion Alert LEDs (7) The Dis tort ion Alert cir cuit is a uni que ADCOM dis tort ion d etec tion syst em w hich read s al l fo rms o f no n- lin ear dist ortio n su ch a s T HD, IM, s lew- indu ced, “cli ppin g,” e tc. The Dis tort ion Alert LED s wil l li ght whe n di stor tion reac hes appro xima tely 1% r egar dles s of impe danc e, v[...]

  • Page 9

    9 W ARNING Whenever connections to or from the GF A-7705/07 are being made, be certain that the AC On/Off Switch (5) of the ampli er is in the OFF position, the AC P ower Cord (4) of the ampli er is disconnected from the AC wall outlet and that all associated components are turned off. Installation & Hookup Unpacking the GF A-7705/07 Befo[...]

  • Page 10

    10 Connecting the GF A-7705/07 R emember , that the Left and Right designations are as you are sitting down in your listening/viewing area. On the rear panel, the inputs and outputs are grouped in 5 or 7 bracketed sets, one set for each channel. They are as follows: LB — Left Back (GF A-7707 only) LS — Left Surround LF — Left Front C — Cent[...]

  • Page 11

    11 Inputs (1) T o preserve the correct effects, be certain to connect the RCA cables to the proper RCA-input connector . If the cables are color coded, then use this sequence for the connections: Blue ............................................................ Left Front R ed ........................................................... Right Front [...]

  • Page 12

    It is suggested that the three front channels follow this chart for speaker lengths and wire gauges. up to 24 feet ...................................... A WG16 up to 36 feet ...................................... A WG14 up to 58 feet ...................................... A WG12 Generally , for the two rear surround channels, longer runs of cable [...]

  • Page 13

    T roubleshooting Resolv ing Problems Use the chart below to solve common situations that don’t require professional attention. If the steps stated in POSSIBLE SOLUTION do not resolve your problem, then please contact your ADCOM Dealer or call the ADCOM Customer Service Department. Any problems not covered here should be brought to the attention o[...]

  • Page 14

    Serv icing ADCOM has a T echnical Service Department to answer questions pertinent to the installation and operation of your unit. In the event of dif culty , please contact us for prompt advice. Please have the following information readily at hand: the unit’ s model and serial numbers, and dealer from whom it was purchased. If your problem c[...]

  • Page 15

    GF A-7700/7707 Speci cations P ower Rating (T o EIA/CEA-490-A Requirements 200 W atts continuous average power per channel into 8 ohms at any frequency between 20Hz and 20kHz with all channels driven at less than 1% THD. 300 W atts continuous average power per channel into 4 ohms at any frequency between 20Hz and 20kHz with all channels driven a[...]

  • Page 16

    8541 East Anderson Drive Scottsdale, Arizona 85255 V oice: (480) 607-2277 Fax: (480) 348-9876 www .adcom.com gfa7705/07_manual_v1[...]