Well this is what happened. I have had this amp for about a year and its worked fine but i thought i would be different and i changed the shift phase knob on it from the end it was on to the other end b/c i thought it would allow for the subsonic filter to shut off for lower resonance but i was wrong. I believe it ended up blowing 2 cubes in my amp and now i need to get i repaired but i dont know where or how and even if i can repair it. It was a great amp and id like to keep it. Is there anyone out there that can help or might even know what i did really to make it blow? Help would be very appreciated. Thanks in advance.