I have a 20 year old Kenwood receiver that only has inputs for two pairs of speakers. However, I wanted to hook up not only one pair of indoor speakers and one pair of outdoor speakers (patio) but also a new pair of outdoor speakers for a screened-in porch. As well I wanted to be able to use a single hook up to play my iPod on all sets of speakers. So I saw that this unit had not only an ability to power additional speakers but also an ability to do so in such a way that I could use this unit as an input to the Kenwood receiver. I simply wired the new speakers to the new AudioSource AMP-100 and used a basic RCA cable to connect the output line of the AMP to the Phono input of the receiver and presto it all works like a charm. This works exactly as I expected and I love having this product.