OK, those two subs are my final choices. I couldn't care less which one I had. They are the same price, and I have room for either, and the 'looks' of each are equal in my eyes, thought I would choose the box if all else was 100% equal. In terms of the specs, which one is 'better' than the other, as far as output or extension? The box is tuned to 22 Hz. while the tube is 20 Hz. - so no difference. What about overall output? I can't decide - help me!