Looking for power amp with warm, smooth sound


Have some Monitor Audio RS6's that are sounding bright and fatigueing to my ears with my Marantz 6003 receiver. Would adding a power amp with warmth tone down the brightness and add more fullness to the sound of the speakers? I would use the Marantz as a pre for now. Any recommendations for one under about $1200?
lefty5432
Thanks, Blindjim, for your history. I feel bad that I don't love these speakers since so many have raved about them in other forums. So, it is good to know that others have found MA to be more home theater than music oriented. I want warm, smooth, non-fatigueing music first. Then we can watch an occasional movie. I don't care if I hear every detail or if the blasts are thunderous. Music is what I listen to every day in the background, and we might watch two or three DVDs a month. Just not sure how to put a whole system together that is reasonably priced, when there are so many components and I need to listen to, in so many different locations. By the time I had listened to the 6th pair of speakers, several days had passed and I can't compare it to the others I liked somewhere else. Then add in comparing amps or receivers and then which goes with what. Its like solving a puzzle! Thats why I chose what I liked best at Magnolia with what they had available in the price range. But they don't play music that "moves me". Yet, in these economic times, I can't move up to expensive equipment. So that is why I am on this forum, avs and audiogon to get suggestions on how I can find what might best suit me in a moderate price range from people like you all that have experience with a variety of components. Something I do not have. I am here to learn and get suggestions so that I can direct my search, rather than just guess randomly or buy something in one day from one place (as I did with the monitor audio).
By definition power amp is NOT suppose to affect the sound.
The only job power amp is doing is amplifying signal. If you find power amp with warm sound or sharp sound or smooth sound it can only mean one thing : the amp is broken.
It could be that it was damaged in shipping or damaged by starry-eyed, kitchen table engineer.
In either case my advise would be to avoid such product or be eventually dissapointed.
Lefty - OK. Nevermind then. I had some suggestions of dealers to visit if you were in southeast. You might want to check out Audiokinesis or Adaleus, both out west, though not in Seattle. Their speakers and amp suggestions are far from bright.