McIntosh MA6900 Sensitive to Power Cords? I have

No idea. I don't recall the sound changed all that much.

The 6900 would need nearly 300 hours to fully settle down IMO. The bass would be the last to sound right. My 6900 went from being bright - veiled - no bass - sounding really good. Maintain a log if you can. This way you don't have to keep guessing. Good luck & enjoy !

I have a pair of N803 working with my MA6900, both the speakers and the Amp were newly purchased last Summer. I like the sound and is very happy with this combination, I like Jazz, female vocal, and classical. The MA6900+N803 gives good details in all range and good enough bass, the high is outstanding. I am using Silver interconnect and Silver alloy Power cord to add speed and details to the system. One of my HiFi friend had a recent audition on my system, and he said my N803 still need more time to break-in, and he expect the bass will be even better when the time come. However, he agrees that this is above average sound that I can get with this budget. By the way, I am using a Marantz SACD player as source, am thinking to add a DAC for CD listening for the next upgrade, any comment?

Hello: I'm not familiar with B&W speakers. I'm currently using Def Tech BP7002's and a Simaudio Nova cdp with my 6900. I will probably purchase the Ohm Walsh 100mk2 or 200mk2 speakers for a home trial soon since I am not satisfied with the bass on my current speaks. IMHO you will definitely want to upgrade your source which would seem to be your weak link just as the back end seems to be my weak link. I still don't think I've heard the full potential of my 6900 yet. And, I think you may be experiencing that too. For me, my weak link may be the back end for you maybe the front end.