hi....hope someone can help me with the problem i have. I just setup my 5.1 home theater system( JVC RX-D402B reciever, JBL Northridge series speakers). All was fine until today, i hear a "boom" sound from my sorrounds, sub-woofer and mains when i switch menu in my DVD player. I dont know why this is happening? Has someone faced this issue. PLease Help Me!!!