Just bought a Marantz PM6006, and it it disappointing


My vintage NAD7020 has been acting up, so I decided to get a Marantz PM6006 on sale.  Figured if I decide to upgrade later it could become part of the AV system.   I had no problems hooking up my Linn Axis turntable and ELAC Debut 6.2s.  But when I started playing music, I noticed the music was muddy and high pitched.  I tested on some jazz (Don Shirley “Tonal Expressions”), classical (Villa-Lobos “Bachianas Brasileiras, Nos. 4, 7”), Rock (The Grateful Dead “The Grateful Dead”) and P-Funk (Funkadelic “One Nation Under A Groove”).  The only song that sounded as good as I wanted was Laurie Anderson’s “O, Superman”, with its heavy synthesizer work.  Throughout each selection I noticed pronounced sibilance, and violin and harmonica were actually painful to listen to. Needless to say, I am extremely disappointed.

Granted, I am used to vintage (used) electronics, and I very much prefer the warm sound of the NAD.  So, is my ear just attuned to warmer sounds?  Or does the Marantz PM6006 need a burn-In period?  
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Well, I have been listening to the Marantz for over a week and am just not happy with it.  Maybe I’m impatient, or maybe I just don’t  like the Marantz Sound.  I really liked my old NAD 7020, and to me the difference between the NAD and Marantz is not to the Marantzs favor.  I want a line out to digitize my records, so that really limits the number of integrated amps I can consider.  I think I am just going to order a Cambridge Audio Topaz SR20 and cross my fingers.  
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Well, got the Cambridge Audio Topaz SR 20 today and set it up.  Sounds good right out of the box, a lot like my old NAD 7020.  Guess I will keep it and enjoy.  Thanks all!
Thanks for sharing your experience.  
I bought a 5004 8 years ago to replaceca nad 315bee.  Returned it because of the laid back sound with no dynamics.
Ordered the 8004, and toroidal transformer and extra power made all the difference in the world.  
This 8004 has been on 24/7 for the past 8 years and does best with neutral to brighter speakers like ls50s, totem hawk, ub5s.. .i would not marry it with warm speakers.