This is from the FAQ on Yamaha's web site. Looks like this would then serve as a preamp for an external amp? Am I interpreting that correctly? Thanks again fellow audio-addicts....
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What are the Pre-Out/Main-In coupler connections used for ?
On certain AV receivers, you may have the ability to connect an external component to affect the overall output. Please refer to the following connection possibilities: Equalizers, Mixers, Subwoofers and external power amplifiers - Connect the pre-out from the AV-receiver to the line-in on the external device. Then connect the line out from the external device to the main-in on the receiver. In the case of an external power amp, you would not use the receiver main in connections.