I use Duntech Prince speakers incl dynaudio drivers, in a similar d'appolito arrangement as your C4.
My advice will be " politically incorrect" but far from stupid:
Buy a sds470 classdaudio amp ,sales price 590 usd, use it without PA,connecting directly to it a digital volume controlled DAC similar to the Weiss DAC2. The sds sends 2X500W on 4 ohms.
Now, if you dont follow my antipolitically correct advice, you can buy an AudioResearch ref150 ... friendly from france
My advice will be " politically incorrect" but far from stupid:
Buy a sds470 classdaudio amp ,sales price 590 usd, use it without PA,connecting directly to it a digital volume controlled DAC similar to the Weiss DAC2. The sds sends 2X500W on 4 ohms.
Now, if you dont follow my antipolitically correct advice, you can buy an AudioResearch ref150 ... friendly from france