I have a Quart reference 4.80 amplifier powering these speakers and the 2010 version Rockford Fosgate Punch 6X9" 2-way coaxials. It is the best setup ever. I am getting a 12" sub to balance out the mids and highs that these beasts unleash, but I can definitely say that these speakers hit harder than four 8" subs. It feels like you are being punched in the chest when they hit. Seriously amazing speakers. Just make sure you have the amp to power them.