Ajani,

A regular woofer is not recommended for OB. It should be full range with a high Qt. rating ( >1 ). The Dayton APA 150 amp linked below will drive two Alpha 15As and no external crossover device is needed as the Dayton ( aka Emotiva BPA-1 ) has it's on active crossover control. The Dayton is on sale now for a great price. You can check out the BPA-1 manual at the Emo site.

If you still have your Emotiva Preamp Dac you could put it to good use by converting the optical out signal from a CDP to analog and sending it to the Dayton while sending your analog CDP output to a separate amp to drive the 8 inch full rangers. This is true bi-amping at it's best and it will sound much better than the OBs in your picture above which employ passive crossovers. Don't get me started on the evils of passive XO's. Solid state is best for bass drivers while tubes are preferred for the upper frequency FR drivers.

SS, I've got a complicated Behringer electonic crossover ( they're all complicated to me ) and the 3 page manual is a joke. I need to take a course in how to set it up.

If you guys ever go OB you won't come back - I promise!

Dayton Audio APA150 150W Power Amplifier 300-812