We have two options when we run into this, and its based off budget.

Inexpensive is to use the AD2002, Bridge mode, turn the bass down.

Next step would be to use Sonance speakers and a DSP amp.

I love sonance, their DSP is great, but I truly think the AD2002 and AD3003 from audio source have a better sounding amp. Yes you sacrifice the DSP with the Audio Source, but the wattage output is much higher. I have two DSP amps I am taking out of my house and I'm putting in the AD3003. Sometimes I think the Sonance just doesn't have enough power.