I'm not familiar with your preamp or your speakers, but I've been running M200 Sonatas in many many different system configs - never any harshness. This includes using a Denon 2200 multi player as a source.
I think Nsgarch has given the best advice, but if you just want to experiment, the Dared 2000A is a 2 input tube preamp with remote volume. They show up on A'gon now and then for $300+ used with upgraded tubes, and I think can be bought directly for under $500 (or 450)
I have one and it's pretty nice for the $, and combines nicely with the M200s
I think Nsgarch has given the best advice, but if you just want to experiment, the Dared 2000A is a 2 input tube preamp with remote volume. They show up on A'gon now and then for $300+ used with upgraded tubes, and I think can be bought directly for under $500 (or 450)
I have one and it's pretty nice for the $, and combines nicely with the M200s