Speakers that are good with tubes

Consider a high quality single driver speaker like Voxativ, if you’re searching for musical speed and detail — especially with 300B driven SET. Zu audio can be driven nicely with a low power amplifier but offers more bass with its powered woofer.

It depends on the tube amp and room size as to which speakers sound good with tube amps. 

I had a 20 watt Raven Audio tube integrated driving the supposedly tube non-friendly KEF LS50s in a medium large room and the sound was glorious. 

Also a 100 WPC rogue audio amp with great success driving 86db Harbeths.  

Flip side a 3 WPC SET tube amp likes much more sensitive speakers- e.g. 93db Audio Note AN-J or E.  

I love these threads and how they twist and turn, altering the "purity" of the OP questions.

It's like asking two different people how a piece of electronic gear works:

A typical guy off the street would reply "Push this on-off button".

An electrical engineer would be frozen in place by the complexity of the question.

My Klipschorns have sounded great with a CJ tube amp & preamp, CJ preamp and modified Hafer SS amp, and now wirh a PL integrated tube amp.

( my only concern with the PL integrated is how at listening levels the volume knob is barely cracked open.)

All the “classic” Klispch speakers, some Altec Lancing horn speakers and some of the older JBL horn speakers. I’m not familiar with the newer ones. But like others have said, it’s not all about the watts.

Well considering the OP has a pair of 350 wpc monoblocks I daresay he can pair just about any speaker he likes with them. Obviously some speakers are more tube friendly than others but that's a lot of power to throw at them. @lewl28 If you truly like your Sopra's just enjoy them.