Martin Logan speakers

Since 15 years I have ML   model Sl3  ...odyssey  prodigy and now summit x with viola legacy I' m very happy 

The Vista looks like the upgraded version of the older Aerius i model that I have and they are decent sounding speakers. The ESL speakers have a different sound from the mainstream voice coil design and are also very directional with a very narrow sweetspot. They are bi-polar by design so you need at least 3 feet space behind them to get a good soundstage. As for the power requirements, it all depends on your listening room size, how loud is you listen to your music but I don’t think anything less than a 50wpc 4 ohm capable amplifier will make them sound any good, regardless of the room size. I don’t see a 4 ohm spec for the VT130 but my guess is it’ll have a hard time delivering a tight bass as well as a crisp high octave. The midrange will probably sound real good. By the way, I think the VT130 is one of the coolest looking ARC gears. A real classic. 

I probably should stay quiet, but here's my (limited, very limited) experience with ML's:  I loved the sound but found that the " sweet spot" was incredibly tiny, and that even a half-head's width off of that led to such a stunning drop in sound I could not consider them.  Maybe it was the pair I was auditioning, not sure.  Others may have had a different experience.

I have listened to the M-L Montis in a VERY large room with cathedral ceiling.  Because of the room size we sat farther from the speakers than in most installations and experienced a much wider sweet spot. As has been said here so many times, so much depends upon the space in which you listen.

jcder

I love ML speakers and have owned a few, but with the right amp if your to get the very best from them .
Most ML speakers dive down to less than 1ohm in the highs 10-20khz, this could very well reduce the sparkle and extension in the highs, using the AR tube amp/s it may sound distant and recessed. Also very hard for a tube is around 4.5khz were it’s 3ohm and -60degrees negative phase angle, this could reduce "presence" using tube as an amp.
Here is a shot of the Montis impedance/phase graph, which will be very similar to the Vista.
https://www.stereophile.com/images/912Montisfig1.jpg

Cheers George