Pairing with Vienna Acoustics Hadyn Grand&Rel B3?

Not sure why pair of mono's as oppose to a 2 channel? Do mono's inherently have a high damping factor?

Guido- et al. A friend of mine also has a REL and recently has been experiencing some feedback issues. He called REL to discuss and they said he needed to pair his B2 with a Class A or B amp and not D, which he is currently using. The explanation was a class D was not grounded and because of this could severly damage the subwoofer. Does this sound accurate? I ask because the amps you are suggesting are in fact class D and I don't want to ruin my sub as well.

Also, assuming the Class D is okay, would the Bel Canto M300s have enough juice or is the extra $1500 per mono worth it?

Guido - I appreciate all your dilegence.

Interestingly enough, REL in their manuals suggest that the optimal way to connect to their SUBS is to the speaker terminals:
"It is helpful to know that you will almost always connect the REL to the input on the
rear panel labelled “HIGH LEVEL.” This connection is made using the supplied 34’
10” (10 meters) cable, the bare leads of which connect to the speaker output
terminals of the power amplifier. The easy and foolproof connection at the REL is
done with a Neutrik Speakon connector. The purpose of connecting to the speaker
output terminals is one of the unique secrets of REL’s success. By connecting to the
high level input on the REL from the amplifier, you build forward the sonic signature of
your main system, including the tonal balance and timing cues of the entire
electronics chain. In this way, the REL is fed the exact signal that is fed to the main
speakers."

As I wade deeper into the audiophile pool the water gets more murky :)

Thanks!

Thanks Guido, my intention certainly wasn't to open a can of worms.