So my new SVT 4 Pro arrived today, but when I started playing through it all I got was a low distorted noise. This happens when I have it mono bridged(I do have the switch pressed in for mono bridge mode). I tried different speakon cables and leads for my bass, even tried a 2nd bass but got the same result. Also when I tried both power amp a and b separately(with the switch pressed out) I got no volume at all. Is the amp ****ed or am I doing something wrong??