I bought a Kenwood receiver 6.1 w/ 900 total watts for about $200. I have 3 pairs of speakers in separate rooms all wired back to a speaker selector switch, which is wired into my receiver. When I activate all 3 speakers at the same time and turn up the volume to a decent level, the receiver clicks and shuts off. Even selecting just one pair of speakers and turning up the volume results in the same. I'm assuming I need more power of some type in a receiver but don't have a lot of knowledge in this subject. Can anyone help explain what is happening, and what I need to look for in a receiver to fix this problem? Thanks.