15 in full range drivers

Great responses, thank you.  The Tannoy's are what I tried to build myself.  Definitely an option with either the Super Gold 10 or 12's.  I am afraid to go listen to them as it may end up being an expensive day.  I have the Western Electric 300B sets and just last night hooked up my Parasound A21 with a Parasound pre amp from a Bluesound Node streaming HD music. The Parasound was driving some Sonus Fabers in another room.  The Solid state is overall a better sound for most.  But for certain music, the 300B's are magical, however in general are to "smoothed out" as my wife says.   

Room is 15 x 15 ft, and10 ft ceiling, area rug, no room treatment with back wall having large walk through opening.  When we sit off center it is less fatiguing, but also loses its sparkle.  Most likely will keep the Parasound driving them and just connect the 300B when appropriate.  Most likely the tubes will just sit there and look cool. LOL.

Go with new speakers. Full range drivers suck at reproducing multiple frequencies at the same time.  That’s what’s causing the fatigue. Of course they sound beautiful with voices,  but add some drums, a guitar or two and it’s a total mess.  That dog don’t hunt. A Heritage speaker would be a much better choice. 

To suggest that a full range driver coupled with an SET amp is limited to vocals or a small segment of music is just not true for many of us. In fact, quite the opposite.  I have two systems that could be not more different.  One has Tekton DI's coupled to a pair of HSU 15 inch subs powered by Marantz Ruby electronics.  Very little that system can't handle.  My second system has a pair of Omega monitors driven by an Erhard Ray 6L6 SE integrated.  I can listen to a large part of my music collection on this system all day long.  No fatigue.  I dare say I might listen to this system more than my other--but I love them both.  

You might find this site interesting--check out glowinthedarkaudio.com especially if you are into DIY full range drivers.  

@zagorskia  what 15" driver are you using?

@corelli  At volume does your Tekton system start to outperform your Omega system, playing something like rock or orchestral?  70db?  75?  In OPs own words he describes his system as fatiguing.  And your suggestion is what, grin and bear it?  Maybe read more "expert" opinions on the virtues of single drivers and low watts?  There is nothing more audiophile I guess then building a system that mandates a ton of excuses that only a handful of people would appreciate.  

Just a FYI. When a speaker is considered bright or fatiguing, it is hardly ever high frequencies that are the culprit. More often than not it is the upper midrange.

@czarivey 

Pretty stupid statement. My 300B amp sees a regular diet of metal, hard rock, big band, Latin jazz, and a whole host of stuff that requires some grunt. Never breaks a sweat.