Thanks guys. I think I've narrowed it down to the PPI/PA and the vfl 150.4. :-) I really super appreciate everyone's help.
I'll certainly let everyone know how it goes!
No problem IMHO. If you're worried too much, get hold of a DMM and set amplifier gain by DMM.2) At 2 ohms, the XD500 pushes out 300RMS, but the ID8 D4 recommends 150RMS.
So I'm looking for advice in terms of alternative amp choices and whether I should get the 4 ohm or 2 ohm sub.
Thank you all in advance!
Regarding amplifier, if you're going to drive subwoofers and speakers with one amplifier, get a relatively high power 4-channel amp, as the more power is normally better for the subwoofers. I'd mention the PPI Phantom P900.4 too. This thing normally costs $200 online. The value is incredible. You get respectable 450watts on bridged channels, small case, and the thing never runs hot. Another interesting amplifier is Alpine MRX-F65. While a bit more expensive, I suspect its more refined when feeding full range speaker channels. JL Audio is a respectable amp company. If you have interest in HD or XD amp go for it.