Surround Sound Help

[nordic217]

Hey Guys,

I've had my surround sound system for a couple of months now, and think there might be something wrong. On certain Blu-rays or DVD's I have a vibrating sound coming from all four of my surrounding speakers, but not the front one. It usually sounds off when the music in an action scene gets louder.

I'm thinking it is busted, but I don't turn the volume up loud a lot, and that vibrating and rattling sound comes on only when scenes that have loud music come on.

I have a Pioneer VSX-917V reciever and JBL SCS145.5S Speakers. The movies are being played with a PS3 over HDMI, with the optical audio output. I'm hoping I just have to adjust settings, and if so, what would I need to adjust? Also, during normal movie play, the front speaker is pretty soft, I have to turn up the volume pretty high to hear it. Thanks in advanced.