This can only be done if you have non-amplified "RCA" preouts along with the regular speaker terminals. These would be used to hook up the amp to the receiver.
Not all amps have these so you will have to look.
C. Ryan
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You cannot "add" an amplifier to the one in a receiver. You may substitute an external amplifier for the one in the receiver--if the receiver has preamp outputs. Of course, then you are wasting your receiver's amplifiers.
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Norm Strong ([email protected])
This is typically done only if you are "running out of gas", i.e. your receiver can not keep up with your volume requirements and /or your speaker requirements.
My B&K receiver had 7 channels of amps- and pretty good amps at that. I kept the front two channels on the receiver and put all my 5 surround channels on an outboard B&K amp. Now my receiver runs very easy and its large power supply is used only by the front mains. In two channel listening I don't even use/turn on my big multichannel amp.
Look on the back of the receiver for the output jacks.