i am having a problem with my logitech z506 speakers. but only the rear ones. this is a 5.1 surround sound system but i have to keep it set to 7.1 for whatever reason (but these rear speakers show up as the side speakers and i disable the rear ones). if i use 5.1 i only get sound from the front left speaker. anyway, when i test my speakers in windows they all work splendidly, but when i play games or listen to music my rear speakers do not work. i can detect a very very low sound coming from them but only when i put my ear to it. can anybody help me please?