ProAc Response 2.5 Vs. Spendor SP1

Those are two different birds. The Spendor more relaxed, and the Proac faster and more holographic. If you hear them, you'll know pretty quickly.

Thanks,guys I will listen to them. From what I read 60w per side of tube power should be enough for them, Yes?

The Aronov will get the job done. I ran mine with an Aronov integrated for a while.

When Dennis Had was still at Cary, he used ProAc speakers to voice his amps.  On his recommendation and that of my dealer (Arnie, the founder of the original Audiogon), I got a Cary CAD301SE amp, a glorious 11 watts per side, that drove them to perfection.  I still have them in my second system, with Ayre 60W.  They are a very fine speaker, the main driver unit is superlative, and they go deeper than you'd imagine.

Take a look at the review in Stereophile if you have not already.

https://www.stereophile.com/floorloudspeakers/196proac/index.html