Before today I was running a BX1000D at 2 ohms (700 watts) on my Matrix Elite 12... and it sounded all right... got loud and low... but had an overhang problem.
Today i got my Tantrum 1200.1 and decided to try it out before I got another ME so i could send 700 to each one. So since my ME is a dvc 4 ohm model, I called up the PG tech support and asked them what power the tantrum does at 8 ohms because I didn't wanna fry my sub. The tech support guy told me that it should do 600-700 w at 8 ohms (****ing insane amp) and that was perfect for my sub.
So i wired it up in series... and its not necessarily louder... but it is SOOO much more accurate, punchy, and tight than the Brutus was. Its a completely different kind of bass, it hits you in the chest instead of rattling your ***.. I can't emphasize enough on how the upper bass region was improved and the lows sounded so much cleaner.
For anyone running budget amps, I will definately support the conception that a watt isn't a watt and that better built amps in fact DO sound much better. So for all of you who got cheap on those amps... try something with a prestigious name and experience the difference.