A friend of mine is going to buy a JVC receiver because he wants to use it with his computer, No I can't talk him out of it. He asked me what the "SUB-WOOFER" ON/OFF switch on the front of the receiver did? That was news to me, I know receivers have sub-woofer on/off "SETTINGS" in the menu but I've never seen a receiver that had an on/off button on it. Could it have anything to do with bass management & JVC's DVD-Audio? Thanks in advance for any help.