Sony STR-GX909ES Operating Instructions Manual page 10

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By connecting the external power amplifiers and a pre-amplifier to this receiver, you
can obtain a powerful sound.
Power amplifier for ,
Power amplifier for
* [Monaural power amplifier
the front speakers
the rear speakers
for a center speaker
LOW FILTER switch
Pre-amplifier for
the front speakers
Subwoofer with a power
amplifier
Before connecting the PRE OUT/MAIN IN jacks,
remove the shorting plugs. When the PRE OUT/
MAIN JN jacks are not connected, keep the
shorting plugs inserted.
When connecting a monaural power amplifier for a
center speaker
Connect the input jack of the power amplifier to the
SURROUND CENTER jack of this receiver.
When connecting a subwoofer with a power amplifier
Connect the line input jack of the subwoofer to the
SURROUND MONO jack of this receiver.
When using subwoofer not having a power amplifier,
connect through a monaural power amplifier.
When connecting a power amplifier for the rear speakers
Connect the input jacks of the power amplifier to the
SURROUND OUT REAR jacks of this receiver.
10
When connecting a pre-amplifier for the front speakers
Connect the input jacks of the pre-amplifier to the MAIN IN
jacks of this receiver.
When connecting a power amplifier for the front
speakers
Connect the input jacks of the power amplifier to the PRE
OUT jacks of this receiver.
To obtain a powerful sound from the rear speakers
Insert the shorting plugs to the MAIN IN and SURROUND
OUT REAR jacks and then connect the power amplifier to
the PRE OUT jacks.
On the LOW FILTER ON/OFF switch
With setting the LOW FILTER to ON, the low frequency
signal from the front speakers will be cut, and better sound
effect may be obtained when using a subwoofer.

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