Luxman M900u match with Modwright LS 300, one or two 900s needed?

Thank you for responding. Yes, the LS 300 is a total winner. I love it! In this past year I have owned an ARC REF 10, Rogue RP7, and a very high end passive, and went direct to amps with both a dCS Bartok and Vivaldi, so I have some framework to judge.  I didn't pursue the KWA 150 as I don't have access to listening to one without buying it, so I based my purchase on research. I did buy a NIB m900u and hooked it up on Friday. So far I can tell it has greater resolution, more depth, but less bass impact than the Parasound JC1+s. The problem I am having (confirmed by my wife) that it's overly bright on female voices, strings and piano. I like certain aspects of the 900 a lot, but my wife won't stay in the room with it, and I don't really enjoy it. At this point I am even more impressed with the JC1+s. We find them very musical, powerful, with great foundational bass. It must be me as it seems that the m900u is a favorite of the popular media reviewers, Jays Audio Lab, and lots of forum contributors. I will be patient and let it burn in paying music for 200 hours before I pull the plug and put back the JC1+s. It could also be my Vivaldi being bright, my Sasha 2s being bright, my room, or a lack of system synergy. It there was synergy with the JC1+s, but all the dogging of the JC1+ did make me curious. In fact I now have heard in my system that there are amps with greater resolution, I just may have to look somewhere else to find a powerful, resolving, SS amp that sounds musical in my system. Two guys I respect mentioned Ampzilla 2000 V2s. I said WHAAAT? 

what didn’t you like about a REF 10 ?

It's really not that I disliked the REF 10. I don't have anything bad to say about it.  It's also one of the coolest looking pieces I have ever had in my rack. It struck me as such a neutral implementation of tubes that I could have have been listening to a SS preamp. I wanted a tube sound to help with my digital source. I don't think I fully understood the ARC design goals. It had the best volume control I have had to date, and sounded great at low volume. The fact that I couldn't roll tubes turned out to be a problem for me. The problem I keep having is that with all the reading you can do with a piece equipment, you don't really understand it until its in your system and playing in your room.