the sensitivity is a little low, but a friend has some Focal Monitors with the SLI80 and they sound amazing.
12 responses Add your response
Donjr, the truth is that tube amps typically have high output impedances and therefore, will interact with the impedance of the speaker more so than an amp with a low output impedance. There's no way around it. Some speakers are designed to present more of a resistive load to an amp and will be better suited to tube amps. Unfortunately, it seems many speakers (maybe the majority) today are designed for amps with a low output impedance.
The fact is that considering a tube amp forces the consideration of the impedance curve of the speaker. It usually forces the consideration of speaker sensitivity as well. Impedance matching of components, including speakers, is just a fact of physics in this hobby.
See this for reference: http://stereophile.com/reference/810/
Take a look at the impedance curve of this speaker: http://stereophile.com/floorloudspeakers/zu_essence_loudspeaker/index5.html
Compared to this one: http://stereophile.com/floorloudspeakers/1208thi/index4.html
The first speaker will present a more colored presentation than the second speaker. The same is true of this speaker: http://stereophile.com/floorloudspeakers/1205bw/index4.html
Thanks Bob and Superwolf. Bob, that information helped me out and I appreciate you taking the time to post it for me. I've been at my wits end lately, knowing that I messed up bad with the system I purchased this year. Hopefully I can get on track. I'm going to have to keep the CM7's for a couple of years and focus on an amp.
Donjr, I imagine that B&W would send you a graph of the impedance curve of the CM7. If it doesn't vary too much or is somewhat centered around one of the output taps (like the 8 ohm) of a tube amp, you could be quite happy with a tube amp. Your room will also affect the frequency response so the combination could work in your favor. You might also consider a tube hybrid amp or a tube preamp with a solid state amp.
Best of luck in the hunt.
Thanks Bob. I e-mailed B&W in the U.S. to see if they can get me the graph. I wonder if my new Rotel RB1582 would sound good with a tube pre-amp? I currently have it for sale on Audiogon because the Rotel amp and pre-amp sound so bright and can't listen for more than about ten minutes. Its obviously both the speakers and the amp and pre that are all kind of bright.