Hello. I'm having problems with my ASHDOWN MI550 class D head. This head is listed as being 500 watts when run at 4 ohms, and as many have noted....that rating does seem to be a little over exaggerated. I have two Eden cabs w a 12" (no horn) in each that are both 8 ohms. Now, my understanding is that running the two cabs will show the amp a 4ohm load and produce the full horsepower of the amp (not to mention that two cabs SHOULD be louder than one). But here's the deal....using both cabs actually steps down the output of the amp! And the tone thins out some. Unplug one of the cabs (at the amp) and the volume noticeably increases as does bottom end! I've tested each cab, each spkr cable, and ea spkr output jack on the amp. All work fine and it's the exact same deal no matter which cab/cable/output jack is used. I really love the tone of this amp but would like to get all that's supposed to be there. Ideas? Thoughts? Thanks for reading and any help.