Adcom GFA-7700 ユーザーズマニュアル

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-7700. 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 unless you demand 

excessively high volumes levels from your system.

It is not recommended that you run additional sets of speakers on any or all of the amplifiers in the 

GFA-7700 in order to insure the integrity of the system. If you choose to add remote speakers in 

another room, it is strongly suggested that a switching system to disconnect the non-home-theater 

speakers be incorporated when the surround sound, home-theater mode is in operation. A device such 

as the Adcom GFS-3 or GFS-6 Speaker Selector is strongly recommended. A Speaker Selector enables 

you to maintain integrity while giving you the flexibility to add speakers throughout your house.

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.

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