Need some Tube and Class A SS Suggestions

The only time I get infrequent high frequency distortion/edge/glare revealed by my D7's is with a digital stream in my system.  It never appears with vinyl. I use an Auralic Vega G1 and I suspect I'd need to move higher up in the market to get something digitally with a more organic presentation.  The thing is that I have zero interest in putting money into a digital front end.  Sure, it sounds pretty dang good but I use it mainly to explore new music and find new ideas for purchase on vinyl...or as background music while I'm working around the house.

I would be curious among this group whether they notice the strident tone only with digital as well.     

@millercarbon
Maybe I am using the term revealing incorrectly. Maybe it's sibiliance in the high frequencies? I don't know, whatever it is it is uncomfortable to my ears at medium or high volume on certain tracks. A good example is the lead guitar on Wilco's Hate it Here. I don't ever remember this song as being bright. But don't get me wrong, this speaker is amazing in literally every other way.

Okay. So is it uncomfortable because its too loud? Or because it is harsh or grating? twoleftears is right about the massed strings. Violins produce a sound comprised of lots of little bursts produced as the bow is drawn across the strings. There's several strings on the violin and a whole bunch more on the bow and so then when you get a whole section of them playing together a lot of components can't keep the details straight and they all congeal together and that can be painful. When if they are kept straight its impressively moving. One might even say exhilarating. 

Doesn't have to be massed strings. Could be soaring electric guitar, cymbals, anything loud and complex. The key is being able to keep all the many strands playing together separate.  

Then when you get a better handle on what it is, are you even sure its the speakers? Often times people blame (or credit) the speakers just because it seems so obvious, when it turns out to be the speakers are just putting out the signal that came in.

Well I upgraded from some older Monitor Audio Silver S10s, which are warmer and more forgiving to poorer recordings. I played them back to back on the same recordings and the MA is just not as bright in the treble. Midrange is more recessed and pushed back. Bass is warmer but not quite as impactful. I still have both speakers here so I can switch back and forth.

I'm going to give the Spendors more time to break in and see how it goes.

The only time I get infrequent high frequency distortion/edge/glare revealed by my D7's is with a digital stream in my system. It never appears with vinyl. I use an Auralic Vega G1 and I suspect I'd need to move higher up in the market to get something digitally with a more organic presentation. The thing is that I have zero interest in putting money into a digital front end. Sure, it sounds pretty dang good but I use it mainly to explore new music and find new ideas for purchase on vinyl...or as background music while I'm working around the house.

I would be curious among this group whether they notice the strident tone only with digital as well.

I've got a PS Audio Directstream with the Bridge II streamer. I am not hearing digital as being the problem. The same recordings on Vinyl have the same results for me.

I am in the same boat here. 
I have upgraded my system. Currently have a Linn Majik DSM (w/ amp and volume turned off) that feeds a Pass Labs XP-20 preamp and a 250 watt Bryston 4BSST-2 power amp. I have new demo Spendor D9s. Playing vinyl sounds awesome but certain digital recordings can have too much steel edge and grain. The middle and the bass are superb though.
Did some reading and it might be that the Bryston is a poor match with the Spendors. I was going to replace it and then Covid-19 hit. This is a remote location on a small island. So I have postponed replacing the amp with a warmer SS or tube base amp. 
But then it hit me: the sound is changing! Very, very noticeable: the highs are softer and more detailed with less reaching for the volume than I did when I first installed the Spendors. I have also been playing with the Linn Space Optimization system. Getting a better result with time and experimenting with the created Linn profile.

So, I am glad I did not rush out and get a new amp. I am in no rush to do so now. I will keep playing the Spendors and listening to their changing sound. I will then get a new amp as a test. No rush though. Who knows how this will work out?

Bottom line: I was somewhat on the fence with component & speaker break in periods? But these Spendors are opening up like a fine wine in a decanter...