Well, I finally made a decision on my sub design. I figured for my needs a 75l DPL12 should fit the bill, at least for now. I am a virgin when it comes to subwoofers, or DIY projects as far as that goes. I figured that I could take the money for a plate amp and put it towards a new Denon 1603 receiver (last years model i.e. on sale) and use my NAD3150 to drive the sub. I was a little concerned about the power, ~60 watts/channel @ 6ohms or bridged for ~150 @ 4 ohms. Because I wanted to use the NAD and wasn’t sure that I wanted to commit to a 3.4 ohm draw, so I installed a dual binding post cup so I could the voice coils separately or in parallel. So far I find that I have more than enough power running the VC separately (left – Right). I have to say that I am thoroughly impressed with this little sub. Although, after I finish building a pair of surrounds and center channel, I think that I will have to try Chris Brady’s push-pull TL sub but first things first.