Atma-sphere S-30 with Reference 3A?

Well said Marty. Sean, what does the commentary do for your "upgrade" plans?

It is enough power with the DeCapo's sensitivity (92db?), only question is does the DeCapo have a smooth impedance curve which is important with the OTLs, 30 watts should be enough watts though. The M-60s are way more than enough watts with my 89db Merlins (twice the wattage = 3db) (which do have a very smooth impedance curve).

I take it that if Mrderrick's M60s work with the DeCapo the impedance curve should be fine for the S-30.

If Sean wanted to stick with Atma-sphere would a Speltz transformer to raise the impedance be adviseable, or the S-30 just less than ideal for the DeCapo?

I think an amp that might work well if there is a lot of impedance swings in the speaker would be the Pass XA30.5, which also happens to be one of the best amps I've ever heard with my Merlins, although If you believe Ralph Karsten (why woulnd't you?)all amps will work better into flat impedances, the higher the better. I don't if it is always true, but my impression is that speakers with impedance swings are best handled by SS amps.

Ditto for the M-60s with MXs; a great pairing and all the power I need for my room and music.