:b I have been tossing around the idea of building my own subwoofer. My plans/schematics keep changing, I hope to settle on a design soon. but, for right now, I am on an information hunt. Whether I go with 12", 15", tube or the EBS design seamed to be enough to consider. Well I had decided on a Shiva EBS design, but now that I see a new house in the near future, I may go with an IB setup if I can arrange it. My question for now is regarding powering this new unit. First, I assume that a driver in an IB sub cannot handle large amounts of power, how much power can you deliver to a Tempest in this setup? Second, I presently have a NAD3150 and I am in the market for an HT receiver. The NAD is designed to be bridge and run in combo with a 2150,one running the left channel and right on the other. My understanding of the HT receivers is that the can control the sub crossover and volume. If this is correct, could I use the 3150 in a bridged mode delivering 125w/ch to drive a subwoofer? the speaker "A" to one voice coil and "B" to the other.