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
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? 
Any of a number of ways. But that's not the question now, is it? You clearly have great sound already-
Anything by Bill Frisell, for instance, sounds phenomenal. You feel you can grab the instrument from the air. 
To think you have a system that can do this, but yet it has something so strangely wrong it cannot do it with Zeppelin, is just nuts. You even have the answer already, and yet no one here can see it. Why am I not surprised?

Technically, it is not the recording. To understand what is going on you have to really know and think about all the various steps involved between the performance in the studio and your playing it at home.  

The only way to say for sure it is the recording is to have the master tape. Never gonna happen. Next will be a copy printed at the time. With Zeppelin that will be a vinyl record.  

We know the Zep was really well recorded because, well look:  https://better-records.com/products/ledze3_2104?_pos=3&_sid=3c678aa90&_ss=r  You simply do not get anyone paying $800 for muffled mids. Tom gets big money for these for one reason and one reason alone: they sound freaking fabulous! (I know, I have several.) 

Yours sounds muffled. It's not the recording. What, then?  

Original Master tapes represent a tremendous investment no one wants to risk, so right away they start making copies. These copies almost always are what is used to make the records and CDs we buy. They can be any generation, any quality. Then too the care taken in making the pressing can vary widely.   

If you are streaming Zep guess what? They bought a crap file, probably made from a crap copy of a copy of a copy of a master tape. Something like that. Last thing in the world it has anything to do with is your system. Everyone here should know this. Jeez Louise! 

MC appears to be correct that it's likely a crappy file through streaming. I would try an LP or CD source of the same music and see whether you still get muffled mids.
Buy a CD of Zep I, II, or III and see how it sounds. It should be decent, good for it's day. 
If you must use Zeppelin as the reference, the only releases to use are the 2014 Jimmy Page remasters or the original flat transfer CDs, circa 1986, 87.
High quality records will be costly.

There are other remastered CDs through the years which are bright sounding but these should not be used as reference.