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Фрагмент инструкции
All input and output signal connections should be made only with high quality, low capacitance, shielded cables following the recommendations in the Inputs and Outputs section of CONNECTING THE GFA-7705/07. Quick Connections For those of you who are in a hurry to hook up your amplifier into your system, we have included this quick-connection section. The wiring is straight forward and expeditious if you use the proper cables and follow this diagram exactly. If you have any difficulties or questions, please refer to the appropriate section of this manual for complete descriptions and instructions. 9 Connecting the GFA-7705/07 Remember, 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 (GFA-7707 only) LS — Left Surround LF — Left Front C — Center RF — Right Front RS — Right Surround RB - Right Back (GFA-7707 only) 10 Inputs (1) To 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 Red...........................................................Right Front Green..............................................................Center White with Blue Stripe.................................Left Surround White with Red Stripe.................................Right Surround The recommended maximum RCA cable capacitance should be less than or equal to 30pF per foot when measured between the two conductors, and less than or equal to 50pF per foot when measured between one conductor and the shield. Outputs (2) NOTE: The GFA-7705/07 is “polarity correct”. That is, it does not invert phase from input to output. Any positive signals at its inputs will appear as a positive signal at its outputs. In connecting the amplifier to the loudspeaker, it is vital to maintain proper polarity (positive to positive, negative to negative). On the GFA-7705/07, the positive terminal is color coded RED and labeled “+,” and the negative is color coded BLACK and labeled The positive terminal on the corresponding loudspeaker will be color coded RED, or will be labeled “+," “pos,” “positive,” “8 ohms,” or “4 ohms.” The negative terminal on the speaker will be color coded BLACK, or will be labeled “neg,” negative,” “C,” “Common,” “G,” or “ground.” It is necessary that your speaker cables be terminated with “U”-type spade connectors. These will give the most contact area insuring long-term reliability. The spade connector should have a maximum width of 0.57 inches and an ,__^ opening width of no less than 0.25” (see diagram on right). | -j—^-- mac 05" 025-11*1 J I ........I..................,......—......J To properly connect the speaker cable to the binding posts turn the insulated head of the binding post clockwise until the wire or connector is firmly secured. Finger pressure is sufficient and you should not use pliers or other tools which could damage or over tighten the binding-post assembly. The binding posts have been designed in such a way that finger pressure is all that is required to cause a “pinching” action among the different metal surfaces to ensure proper connection. It is very important to use the correct size of wire in order to avoid unnecessary loss of amplifier power in the cable, reduction of amplifier damping factor and other undesirable conditions. Recommended capacitance of the speaker wire should not exceed 50pF per foot. This insures high frequencies will not be rolled-off. 11 It is suggested that the three front channels follow this chart for speaker lengths and wire gauges. up to 24 feet......................................AWG16 up to 36 feet......................................AWG14 up to 58 feet......................................AWG12 Generally, for the two rear surround channels, longer runs of cable are needed, but since less program material is being transmitted through the cable, longer runs are acceptable: up to 48 feet......................................AWG16 up to 72 feet......................................AWG14 up to 116 feet....................................AWG12 If longer runs are needed, it is best to consult with your Adcom Dealer to maximize the performance of your system with your exact conditions. All loudspeakers having a nominal impedance down to 4 ohms can be connected to and driven by the GFA-7705/07. The amplifier can drive these low-impedance speakers at more than adequate power levels with no difficulty. It should be noted here that many loudspeaker systems which are nominally rated at 4 ohms drop in impedance, in some parts of their frequency range, to as low as 2 ohms (and sometimes less). You will not experience difficulties even with these very low impedance loads ...
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