HI all, I just purchased a used M6 Carbine and am having some major problem upon trying it out. I have a ph610 plugged in via 1/4" speaker cable with the switch set on the 8/4 ohm cab setting. I'm using a passive jazz bass with the input switch set to passsive. I have the eq all set to 12 o clock and the di turned down all the way. When I first turned it on, the amp was working fine for about 5 seconds. I turned the master all the way down for a second and then all of a sudden it seemed like the amp started to send a ton of power through the speakers as they were beginning to move and pop so I quickly turned the mute on. I turned the amp off and then tried turning it on a few minutes later and as soon as the mute was turned off the speakers started going wild again. Obviously I'm new with this amp so I'm hoping it's just a switch or something simple that I've missed with the setup. I read the manual though and I'm not sure what I'm missing. Any help is greatly appreciated.