Why is an XA30.5 a bad match for Revel Ultima Salon II speakers?


I actually own Revel M106 speakers right now, but some day, I intend to replace them with full range speakers like the Wilson Sophia II or Revel Salon II.

People say you need a lot of power to drive the Salons. The M106 and Salon II have almost the same sensitivity, and the XA30.5 can play the M106 louder than I prefer to listen (FYI I have a Velodyne powered sub). I guess my ears are pretty sensitive to loud volumes.

Does having all the mass of driving full range woofers into the 20hz range increase or complicate the workload on the amp significantly?

What is it about these speakers and many others that would demand a larger amp even at moderate volumes? My XA30.5 is supposed to be good for about 190W into 4 ohms, but nobody, including Pass Labs, seems to recommend an amp of that size for the Revel Salon II.

If I were to buy the Salons but had no amp budget, would I be better off trading for a more powerful but somewhat lesser quality amp than the XA30.5 such as a Parasound?
sboje

Showing 2 responses by sboje

So in simplest terms, I can think of the impedance curve as an inverse current requirement curve? I can see that the Salon II would take a LOT more juice all the way from 600hz on down, and even more so below 50hz. I can definitely see how any music with significant content in the bass region would demand a lot more from the amp with full range speakers like the Salons.

It looks like even the "friendlier" Wilson Sophia 2 would be a significant increase in workload.

Thanks for helping me understand that!

Thanks for the lengthy reponse Bombaywalla!

Most of my daytime listening is around 80db to 85db according to my ratshack meter's C weighted average mode. I really have no idea what the true peaks would be. I think most music I listen to wouldn't have anything too extreme. Listening to the 1812 overture is a compromise though... I like to turn that up so that I can hear the quiet passages, but my amp is running out of steam for the canon shots.

Having realistic playback levels sounds like a worthy goal, but to give you an idea about my hearing sensitivity, I often wear musician earplugs to play my grand piano because it's too loud for me.

I feel like my system is most coherent and enjoyable at the 80ish db level. Brass and other instruments are really vibrant, and even startling at low volumes.  I'm not sure if that's primarily because the amp has an abundance of headroom at this level,  because the room gets overloaded with slap echo and wall vibration at higher volume, because humans have a different hearing response curve at different volumes, or if it's a combination of all three or other factors. I'm really pleased that my system sounds very dynamic to me even at 70db, and my fiance probably appreciates that at 2am even more than me.

Do you think the dynamics would take a turn for the worse at 80db in comparison to my current M106 speakers?

Is it harder for an amp to send a 25hz signal to a small speaker like the M106 that can't reproduce that, or a speaker that can? Does the crossover actually trim that out of the small speaker and make it easier?