Best amp to drive Wilson Yvette’s

Op when you say headroom what does that mean exactly, are you clipping the amp? Or are you looking for a more lively sound?

The Pass amplifiers are a little dark sounding so depending on your setup you may be looking for a more exciting sound then you are getting now.

You may be turning up the system to hear more detail so you need to evaluate all of your requirements.

Dave and Troy
Audio Doctor NJ

OP:
I find the Luxman and Ayre have a very different sound than the Pass, especially in the bass.

Really suggest you listen though, my opinions here are not shared by many.

I would second the Vitus if you can find one used. The best I have ever heard Wilsons sound was with tubes, but the system ran out of gas very quickly due to the low power of the Lamm amp in the system. Low level detail was exceptional on this system.

Audiovalve makes some higher powered tube amps that are really good. 

Surprised you'd think you need more headroom over what the Pass 250.8 can deliver.  It puts out 250 watts per channel into an 8 ohm load, which doubles to 500 watts per channel into 4 ohms. In stereo, the Luxman m900u by comparison delivers 300Wpc into 4 ohms continuously, although dipping down into 2 ohms the Luxman likely delivers more power than the Pass - but is that really helpful?

I'd vote ARC Ref 75SE as well. Gem of an amp and (relatively) inexpensive