Although I suspect you are right have you tried any other CDP's to make sure you are replacing the right piece? The Dyn's do like some current. What interconnects do you use between the CD and amp?

I drove a set of Dynaudio Audience 60's hard with Adcom separates. A gtp-450 preamp and gfa-5400 125x2 and later a gfa-5500 200x2. I chose the Adcom for it's power and full sound for a system in a workout room. You can find Adcom crazy cheap on Audiogon.com. I'd recommend the 5500 or 555, the 5500 was a better sounding amp with smoother highs. My 60's just sat and smiled at the power while kicking out a great performance. Great bass.

If the budget can stretch look at this baby:
http://www.spearitsound.com/shanling/shanling_a3000.asp

They also have some B&K 250 watt monoblocks for $1150 a pair but then you still need a preamp.

Here's an awesome solution Krell kav-300i not to be confused with S300i. I drove my Contour with this 300i before going to a 500i. http://www.audiogon.com/cgi-bin/cls....ntegrated-Ampl I just wanted to show you this amp and maybe you can see if others are around. This guy has no feedback and the 300i does not have a headphone jack so his comments about headphones threw up a big red flag.

Any way to do it right you will need some power. It could be the Marantz isn't pushing them to their potential which is causing the perception of brightness. It's going to take more than a small NAD or Cambridge. Don't give up on those speakers though they are great.