Several years ago I auditioned an RB1080 vs RB1050 (I think it was 1050, but the smallest of the lot anyway...60 W I think) and the sound difference went beyond just how loud the amps could go without clipping. The 1050 clipped at fairly low volumes with my 90 dB speakers.
I ended up getting the 1080 for sound quality (vs volume). I have not heard the 1070, though.
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