mystery muffled mids


I have a year-old setup I enjoy very much. B&W D3 805s and Hegel H590. Sound is really great. Imagining fantastic. every second with it is pleasure until I try to play classic rock. Anything by Led Zeppelin sounds like someone has smushed the sound and it lost the mid range, imagining disappears. I tried playing louder but live with too many people around to be able to do that constantly. And it did not improve anything noticably. 
I normally stream from Tidal via Audirvana. Anything by Bill Frisell, for instance, sounds phenomenal. You feel you can grab the instrument from the air. I mention this since he uses similar instruments to Zeppelin. Bowie's stuff sounds awful, as does Queen. I know they should sound better. Kind of Blue is fantastic. Gaucho, Sea Change, Elephunk, Wildfloflowers, Know what I mean? -- all great. To a friend, I said that this means bad recordings sound bad. The friend said that's not it. what do you say? How can I improve the sound? thank you in advance.
petar3

Showing 1 response by mijostyn

petar, I am not sure what "muffled mids" means. If there is a peak centered on 300 Hz you will get "muddy" or "thick" midrange. If there is a dip centered at 5000 Hz you will get dull midrange. Both issues can be the result of room acoustics and/or speaker issues. I doubt it would be elsewhere in the system. Speaker issues can include amplifier matching problems. The only sure way to figure this out is to get a calibrated mic and a frequency response measurement program. Then you will be able to see the problem and determine if room treat, speaker adjustment etc. are working. Another way to deal with it is a room control unit. It will come with the mic and measurement program and the ability to EQ your system digitally without any ill effect. This is a great unit, https://www.deqx.com/products/hdp-5/  DEQX also makes a less expensive unit that will also do everything you need. Once you have your system corrected everything will sound better.