Finally, I kept trying to register to post to the forum, but it never would send me a password--then I read the instructions! Funny how that works sometimes. Anyway, I am in the process of building my first Sonosub (second subwoofer project--my first was a 3.5 cu. ft. sealed sub with a Madisound 1252DVC, which I say sounds pretty good, I just wanted MORE!) I used a 42" tall, 18" Sonotube (volume = 5.27 cu ft), tuned to 17.83 Hz (according to WinISD) with 3 - 31.21" long 3" diameter PVC ports, with double MDF endcaps (each with an additional layer of OSB, one so the T-nuts would have something to grab into, and the on on the top, well, just to have a litle extra something inside the tube). Oh yeah, and I'm using one 12" Shiva. Now, I have a few questions: 1. Will an AudioSource AmpTwo run mono-bridged push my new sub good (Shiva run parallel)? It's supposed to be rated at 80 Watts Per Channel @ 8 Ohms, 200 WPC Bridged (8 Ohms), (so I figure about 230-280 WPC bridged at 4 Ohms??) And will the Shiva run parallel present an OK load for the amp? (It's supposed to be stable to 2 Ohms.) 2. I plan on getting a Behringer FBD soon too . . . should I put it in my tape monitor loop, or just wire it between the sub-out and the subwoofer amp so it doesn't affect the mains at all? 3. And before I put the Shiva in, should I put any kind of padding/stuffing/lining in the Sonosub? I know there are different theories out there on this, but I was just wondering if anyone could address this issue directly. I look forward to participating more on this board now that I finally registered. I'm also in the process of building a pair of mains, but more on them later. maybe I'll even get some pictures posted. Thanks guys.