spatial audio m3 or tekton perfect set

I recommend you to try tube amplifier with Zu Dws rather than changing speaker.

Rogue Crouns Magmun II(used) is a good starting point if you play loud or your listening room is big.

If you don’t play loud, you can try 300B SET amp.

https://www.audiogon.com/listings/lis96a90-dared-audio-vp300b-tube

https://www.audiogon.com/listings/lis9cjib-sun-audio-sv-300be-tube

My favorite tube amplifier is Line Magnetic 508 or 805 48W SET amplifier which give very refined sound with enough bass and headroom.

Thomas

Recently at Axpona heard the Spatial Audio speakers and to be honest they did not impress. (Did not hear Zu speakers). BUT did listen to the Tri-Art Audio open baffle speakers which to my ears were one of best of show. 

my take at axpona 2019 was that the spatial x3s and the big tri-art's were among the best sounding speakers at the show.   esp given their price points.

Happy Spatial M3 Turbo S owner here. The open baffle design creates an an amazing sound stage. More info on what you're looking to achieve with the upgrade would help. If you have any specific questions on the M3, fire away. I feel these will be easy to find used once the X5 and X3 get released as owners look to move up the Spatial line.

The Tekton Perfect Set 15 is on my short list for my 2nd (home office) system. I'm mainly waiting until more reviews are available. Given the number of happy Tekton owners, they look like a solid bet for my needs in this system.

Try listening to a well set up pair of Vandersteen 3A Sigs.
 Best JohnnyR