I have yet to clip the ADA-1000. Keep in mind, with the ADA-1000-4 rated at 250 WPC into 4 ohms and the ADA-1250 rated at 312, you are talking a 1 dB difference in SPL. If one does 110 dB clean, the other will do 111 dB clean.

Either amp will kick ass. Call Ian, and ask if the 1500-4 I sent back is available. I had an extra here and just sent it back. It was Axiom's amp, not mine. We both forgot I had an extra. He might swing a deal on it, then you will NEVER look back.