JBL 43xx va Harbeth 40.x

@crustycoot, interesting observation. There's definitely a similarity in the sonic presentation (which you so aptly described) of old 'new england' speakers (like AR) and certain new 'old england' speakers (like Harbeth). I would say Maggies are also examples of this type of presentation, albeit using totally different design and technology. I have Maggie 20.7 and AR11 speakers in the same room and although they're driven by different systems they essentially sound very much alike. 

@6119: agree with crustycoot. Go for the 3 series if you can stretch it, as there's really no substitute for Maggie's true ribbon. But make sure you have sufficient power to drive them properly.

Before you dump your Harbeth's you should read this:

https://www.whatsbestforum.com/threads/harbeth-monitor-40-2.25222/

Also, and just my opinion, the MC275 is not a good match for the Harbeth. IMHO tubes cannot bring out the best in Harbeth speakers. I tried 3 different tube amps with my original 40's and the SHL5+ and they did not work for me in my system. You will find plenty of folks who will disagree with me. YMMV.

If you have a way to borrow a good solid state amp I urge you to try it before you make a decision on the Harbeth. Harbeth uses QUAD SS amps to voice their speakers. Good Luck!

@joey54 wow, that is a looong post in the link.  
No, I am not thinking to get rid of the Harbeth 40.1, at least not for now.  But I think the Spatial X5 sounds more similar to JBL.  Both are efficient speakers, but the X5 is open baffle, while the JBL has 15” driver.  If I am going to get the JBL, I think I will sell the Spatial.  But the open baffle offers excellent live music feeling, and it is very good also.

crustycoot; thanks for the input. My Proton d1200 can put out several hundred watts per channel. there' a youtube about it. but can i put a 3.7i in an 11x12 ft. room? very thick carpeting,llive walls. back and front walls sheetrock, side wall bifold wood closet doors and wood blinds over windows.i understand the 3.7i doesn't have the so called "maggie grain" which i sometimes think I hear......Also I was on this thread because i have been interested in Harbeth speakers. 

Here's a response  that's kind of fits into the thread.
I had the Harbeth C7s  for a year    as I put away my Klipsch  KG5.2 .That's all I listened to  were the Harbeth  and they were nice , I guess .Then  I dragged   out my old Klipsch    and , wow  , there is was , the sound came alive , grabbed  my attention , it  was so engaging .
Sold the Harbeth  and never looked back .
For those that say the sound is  fatiguing with speakers like JBL and Klipsch  , all speakers are fatiguing as you can only listen  for short periods at a time , my experience .      
I'll need to turn the music off at some point  for a piece of mind , quiet time .I feel really sorry for those  that work where music plays the entire time , that seriously fatiguing