I just purchased a sunn concert lead head from ebay and received it. so i connected it to my Acoustic 2X15" cabinet. However all that came out was a loud hum unaffected by whether something was pluggedd into the head or not. I dont know the cab's inpedence(usually use it withan Acoustic 150 head), but could it be the impedence is below 4ohms so the head is heating up and all it does is hum? what could be the prob. thanx,
aldo
