I bi-amped my 801Ns using MC1000 for the low end and an MC2000 for the highs. The tubes really smoothed out the high end in my case. However, the lower power held down the MC1000's a bit. Also, you may need an amp with volume controls. I had to pad down the MC1000 amps as the bass was overpowering the highs. This was, by the way, after McIntosh told me that the two amps should match.
As always, YMMV.
Bill
As always, YMMV.
Bill