Do you have any pics of the old sub enclosure used with the Shivas?
I really think one very strong sub and amp would do you well here. The trick is to fabricate an enclosure that maximizes the woofer performance and not minimize your leg room. Sub orientation is the key issue here as most HO subs are pretty deep with magnet structure and all. One sub I have seen, is very shallow in Depth. How well it performs, I do not know. It’s made by Kole Audio. This one: http://www.justwoofers.com/Woofer_Pages/Kole/KOLE_MFW.htm DETAILS: The MFW Series of subwoofers are designed especially for those who want big sound in a little space. The flat, compact construction of the MFW’s means less volume displacement by the speaker itself, allowing these speakers to operate in spaces as small as 1.0 cubic feet, with a flat response down to around 35 Hz, and delivering tremendous punch from a sealed enclosure. It doesn’t get any better than this. Specs: Kole Audio MFW-12 $120.00/ea., $230.00/pr. 1000 Watts MAX Power 500 Watts RMS Power 200oz. Magnet 2.5-inch Voice Coil Fs:
