40-50w tube amp for Aerial 9

Something that you might like to research, its been talked about quite a bit here as Tvad knows, is the affect of the output impedence of the amp which is not linear thru its frequency response, especially if it is a tube amp many of which have a significant rise in the bass. The output impedence of an amp is not flat accross the spectrum, just as the impedence curve of the speakers is not flat. It helps to know, especially when matching speakers and amps on paper, where the rise in the amps output impedence would correspond with rises or fall in the speakers impedence curve.

Just something to do when your bored. Actually understanding it might even help you when considering the acquisition of new stuff. :-)

There are several tube amps like VAC, Manley or McIntosh that will work well with low impedance speakers. As to Dehaviland I have no experience and suggest you call the manufacture. To see if a tube amp would work with the Aerial 9 speaker you would need to know the impedance of the speaker over the entire frequency range. Tube amps work best with high impedance speakers or speakers that have a fairly flat impedance. The impedance of a speaker varys over the frequency range and a tube amp with higher output impedance than a solid state amp exagerates the variance making the speaker sound uneven. You can look at an article at Transendent Sound on Amplifier Output Impedance Why Its Important to better understand the dynamics.

I have been using a VAC PA90 with Thiel CS1.5 speakers that go as low as 3 ohms and have a fairly flat frequency response with a sensitivity of 86db. These amps are about 45 watts triode and 90 watts ultralinear. If you check Manleys website their amps are designed for an 5 ohm impedance.

Shredder- for some ss amps, its the other way around.
x watts @ 8 ohms
2x watts 2 4 ohms
Its called doubling down. some ss amps can, as far as I know, most tube amps do not do this.

For a speaker designed for voltage paradigm, no big deal. For a speaker that needs high current, its more important.

Vary helpful, thanks much.

Sorry for having more questions, but I am still learning. Anyway, how can you determine how the rise and fall of impedance for an amp correspond with rise and fall for a speake speaker?

Shredder, I don't think the amps impedance changes. You would need to look at the impedance graph for your specific speaker. Maybe you can contact Aerial for help, they also might make a recommendation. Or you can contact Dehavilland and tell them which speaker you are trying to use.