What kind of sound interaction will you have with both a sealed subwoofer and a ported subwoofer? I ask this because I built a ported box for two 10" subs and the sound is good but not great. It just doesn't have a sharp sound for my music tastes. I think the sealed will give me the sound I like but the problem is that I don't think the amp is really big enough to push sealed enclosures. Maybe having a ported sub as well, I get the volume I like plus the sharpness of a sealed.
The lowdown on components: I built a ported box out of two Rockford Fosgate 10" subs, 8ohm New amp -- Yamaha RX-V650 Old amp to power my subs -- Yamaha AX 630 (bought new in 1991) I am using the old amp to power the subs with the pre-out on the new amp.
Since I already had the subs (used in my jeep a couple of years ago) and the older amp, not much is invested.