SUT's -Looking for one with some meat on the bones

While I’ve never heard the D7s specifically I’ve heard a good few Spendor models, but never one with "threadbare" upper mids and lower highs or lacking meat on the bones, as this is where Spendor generally really shines.

I’m very tempted to blame the room acoustics rather than the speakers if such is the case, in which case a SUT will do nada unless you use it to provoke just the bloated sound you don’t want.

I have owned many fine speakers since the 1970's and sold high end audio until the early 2000's.  There has been a seismic shift towards analytical sound in the effort to chase details in my mind since that time.  I have a nice digital frontend, but it is only for background listening as I still far and away prefer my analog rig to relax and enjoy my music.
 
There is no doubt my room is a weak link in my system, but in 30 years listening in this very room, I have never experienced this type of tipped up sound.  It is not a small room measuring 16 by 24 with 10' ceilings, with a fair amount of soft, somewhat plush furnishings.  These speakers were so hyped I thought it would be an obvious fit as I have always enjoyed many different British speakers.
  
  The most logical fix is to replace the speakers, but in this day and age that is less easy as we have fewer and fewer quality B&M operations.

  Looking for a band aid that probably doesn't exist in this case. 
  

Forget the SUT. Sell the D7's and get a pair of Ohm Walsh 2000's. Room-filling, 3-D sound with solid bass! $2800 a pair. I own a pair of older Walsh's and they do indeed deliver the "magic"!

To repeat an earlier question, what phono stage are you using? And are you presently using a SUT; and if so what model is it, and how long is the cable between it and the phono stage? (I ask the latter question because capacitance on the output side of a SUT will be presented to the cartridge multiplied by the square of the SUT's turns ratio, and hence much higher than it actually is).

Regards,
-- Al

@mckinneymike I agree 100% with your evaluation and can confirm from my own listening experience.  I compared the D7s directly against Classic 100s, same room, same system, same (long) afternoon, same music.  For me, the Classic 100s were significantly superior; there was, as the saying goes, a lot more "there, there", and the highs were perfectly integrated in the whole.