Update.
Well I must say I’m very very impressed with these speakers. I’m only driving them with an original Bluesound power node and I certainly have scale!
It is a bit crude in the upper registers but I think that’s the Bluesound showing its limitations.
I would be interested to hear them with some other electronics like some Fosi v3 monos or a tube amp.
What’s standing out, apart from the amount of bass is the clarity and size of the midband as voices are great - hence my interest in a valve amp.
The only real problem I have with them is their size! Wife doesn’t like them at all.
I’ll have to work on that.
Cheers
Glad you like them.

Your wife will hopefully like them better when she listens to more music on them. She will hopefully accept their size, that is. You might say: For good bass they need to be that big.
If you're going to plug in a class D amp, check that it's load independent. That would have been my requirement if I were you.
Tube, oh my god, we're going to have that discussion again.
Well IF you're going to test a tube amp, buy a well-known used one that's in good condition. Take advantage of the fact that the Heco Aurora 700 has bi-wire capabilities:

Power up the bass with class D, the tweeter with a tube amp in that case.
Or try a classic used class AB amp, for example NAD C 320BEE (or its successor NAD C 326BEE)
This is a review and detailed measurements of the NAD C 320BEE power (speaker) amplifier. It is on kind loan. The C 320BEE is a vintage product, dating back to 2003 I think. The BEE designation is apparently a reference to Bjorn Erik Edvardsen who was one of their designers. Can't tell if he...
www.audiosciencereview.com
Used NAD C320BEE Integrated amplifiers for sale on 400+ second hand hifi sites & shops. Use Hifi Shark to monitor pricing and global availability
www.hifishark.com
Used NAD C326BEE Integrated amplifiers for sale on 400+ second hand hifi sites & shops. Use Hifi Shark to monitor pricing and global availability
www.hifishark.com
Edit:
Or take this good, popular one.Power; more than you need so you're on the safe side so to speak.

No load dependence. Streamer and amp, with automatic room correction so you get good FR in your room.
This is a review and detailed measurements of the WiiM Amp Ultra stereo streaming amplifier. It was sent to me by the company and costs US $529. I was surprised how heavy and solid feeling the Ultra is for its size. I upgraded its firmware which went smoothly and rather fast. I was pleasantly...
www.audiosciencereview.com
If you're going to measure FR, I recommend this one together with WiiM's RoomFit, 109 €:
The Umik-1 is a low noise, omnidirectional USB measurement microphone that provides accurate results. The Umik-1 is a class 1 USB audio device, automatically recognized by all operating systems (Windows / Mac / Linux).
www.audiophonics.fr
Much better than using the mobile phone's microphone for FR sweeps/measurements.