Hey Kirk,
Moving between car and home audio is confusing the hell out of me lol. I have the V4 XXX which is a dual 2ohm sub so plays at 1ohm or 4ohm. However, my Zapco C2K9.0 is the 2ohm version so in order to get more SQ from my sub bass, i wired the sub at 4ohm and ran it like that with my 9.0.
It gave it a 3db reduction taking it from 2k rms to 1k rms but the bass was definitely more SQ this way around .
Anyway, the DC-110 should really hammer your XXX as (If I'm not mistaken) your sub is 1kw rms? It is also much more efficient then the newer model XXX that I have and mine was quite happy with 1kw.
I believe the older XXXs such as the one you have are fine from 500wrms onwards. Happy days
Anyway, I may need to hold of my car audio dreams for some time as I have recently (can't think of an excuse why atm), purchased a 2002 Mercedes S Class 320 cdi and it's a bit of a nightmare to work with.
God knows what i was thinking...
If I have confused your home audio thread with car audio and made a hash of everything, let me know tomorrow, it's very late here lol.