External amplifier connections, External amplifier connections ……………… 25, Ch at pe r 2 - c on ne ct io ns – Adcom GFR-700HD User Manual
Page 25: External amplifier connections
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GFR-700HD Owner’s Manual
External Amplifier Connections
The GFR-700HD’s built-in 5 x 145 watts per channel
(EIA/CEA 490-A) amplifier has more than enough
power for most home applications. Nevertheless, 7.1
preamp outputs are provided so you can hook the
GFR-700HD up to an even bigger rig (the GFA-7707
comes to mind), if desired.
More importantly, these preamp outputs can also be
used in tandem with the GFR-700HD’s built-in ampli-
fier to connect a subwoofer (S) and surround back
(RB/LB) speakers.
Connecting an Amplifier
1 Using eight RCA cables, connect the 7.1 channel
preamp outputs from the GFR-700HD to the cor-
responding RCA inputs on your external ampli-
fier.
• Connect the RF, LF, RS, LS, RB, LB, and C
outputs to the amplifier and the S output to
a powered subwoofer.
2 If you have a 5.1-channel amplifier, use five RCA
cables and omit the RB and LB connections. Con-
nect the S output to a powered subwoofer.
Connecting Surround Back Speakers
For full 7.1 surround sound, you’ll want to connect
surround back speakers, which must be connected to
an external amplifier.
1 Using two RCA cables, connect the RB and LB
outputs from the GFR-700HD to the correspond-
ing RCA inputs on your external amplifier.
2 Connect your right and left surround back speak-
ers to the external amplifier.
Connecting a Subwoofer
The “.1” in 5.1 and 7.1 stands for the all-important
Subwoofer, also known as an L.F.E., or low-frequency
effects channel. No home theater would be com-
plete without a subwoofer rumbling your listening
area with thunderous bass.
1 Using an RCA cable, connect the S output from
the GFR-700HD to the corresponding input on
your powered Subwoofer.
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Notes:
• To configure your speakers,
see pages 37-39.
Surround
Back Right
Output
Surround
Back Left
Output
Subwoofer
Output