I basically agree with jinhan. His comments about power consumption are dead-on. I'm sure your DefTech is a very capable sub; I am a little suspect whether it actually reproduces down to 11 Hz.
The form-factor is going to be a huge change; the DT is a REALLY small box, especially compared to an EP600. I should think that the DSP in the EP600 would negate any advantages people might claim about the "musicality" of sealed subs.
I don't get why you're framing this as an "either / or" proposition. Why not just ADD an EP500 or EP600 and run them along with your DefTech?
