proac sound vs coincident sound

Efficiency is two parts essentially - sensitivity and impedance. ProAcs do not have the advertised sensitivity - it is lower in actuality. However their impedance is generally excellent (i.e. high) so they tend to be a great match with tube amps. 40W should be fine as long as your room isn't huge.

They are pretty transparent so they can sound thin and bright as well as thick and rich depending on the electronics hooked up to them. Every time I've heard ProAcs with tubes, the sound has been fantastic. They are especially good at getting timbre right. I have heard just about all the new ones and liked the D15 the best of them all.

Arthur

40 watts should drive the proacs(a great speaker), but the coincidents should sound incredible.

Both speakers have different sonic character. Coincident is honest, good extension and fast. ProAc is "English" - enrichment in mid range with a softer highs. I would say ProArc is a little colored than Coincident. It depends what is your cup of tea. Coincident is flat at 8 ohmn. I use both 25W and 85W class A tube amp to drive my Total Victory II. With the 25W amp, you can't believe it comes out from that small power.It is a very easy-driven speaker. YOu have to listen to both to decide. Different speaker, in fact.