Hi, I am thinking of building two subs using Dayton HF12"s like you used. Music 60%. I use a pair of Dahlquist DQ-20Is for front and two channel. They may hit 35Hz on a good day but I would like to extend this. I have a 7 channel preamp with LFE out and a Berringer equalizer. I also have an Aragon 4004II which is rated at 400 wpc @4ohms to feed the subs. Size is not that critical(nice wife). Any opinions from a fellow Dahquist owner will be great.