I want to use the Sony STRDH770 7.2 Stereo receiver with a set of Yamaha NS-SP1800BL 5.1 Speakers. The stereo is rated at 145 watts per channel and the Yamaha speakers are rated at 100 watts. I'm kind of new to home audio an have only set up an all in one DVD/stereo/speaker bundle. Would these speakers work with this stereo correctly running at 5.1 audio instead of 7.2? (My room doesn't have the space for 7.2 speakers)