High Sensitivity Speakers that work best with SS

Hi Mapman, high sensitivity speakers are problematic with a lot of solid state amps because they have much higher back EMF, which tends to really mess with the negative feedback that the amp employs.

If the amp has a higher output impedance this is less of a problem. One way to simulate this if you have a solid state amp is to put a resistance in series with the output of the amp (which will also reduce the back EMF that the amp sees) but of course you will loose a fair amount of power across the resistor. This will result in the higher sensitivity speaker (ex.: horn) being less shrill.

However if you are auditioning high sensitivity (I would define that as being 98 db 1 watt/1 meter or more, less than that I regard as moderate and less than 89 db is low) speakers, if you happen to hear what tubes do on them there may be no going back. Good Luck!

Atmasphere.

Good info. Thanks.

Is it reasonable to extrapolate then that "medium sensitivity" speakers, say 91 db are subject to the same issue, but to a lesser extent in general than "high efficiency" speakers? Is the dependency a linear or non-linear one? I suspect it is more non linear to some extent.

My Triangle Titus speakers are in your "medium" category. I think my other speakers, Dynaudio and OHM, fall into the low category.

What I hear with all these running of various SS amps in general over the years would seem consistent with what you indicate. Triangles are clearly the most "tube friendly" I own currently I would say.

I have dabbled with the idea of trying high efficiency speakers but have hesitated to do so with SS amplification. I hope to try to set up an optimized system around a low power tube amp some day, maybe starting with my current Triangles. I would really like to hear them off a decent low power tube amp. Currently, I am running them in my second system (2 channel mixed A/V, audio use, mostly audio) off a pair of TAD Hibachi 125 monoblocks, which have some tube-like tendencies but are solid state, with very good results (within the limits of the small Triangles). A decent and reliable low power tube integrated might be worth a try in that system.

Hi Mapman,

Interesting point by Ralph, which I haven't seen stated before.

There seems to be a fairly wide consensus that Daedalus speakers will be compatible with pretty much any amplifier known to man, apart from some of the very low power SET's. My Ulysses are 98 db/1W/1m, the figure for the smaller models being a bit lower. I wouldn't say that they would "work or sound better with SS amps than tube amps," but rather that they would be similarly compatible with both, and the differences in the character of what is heard would reflect the intrinsic differences between the amplifiers.

Part of the reason for that versatility is undoubtedly that their impedance curve is unusually flat. I believe that my Ulysses are roughly 6 +/- 1 ohms above 100 Hz, with a gradual rise to about 10 ohms below 100 Hz.

FWIW, although I and many others prefer tube amps with them, Lou Hinkley of Daedalus tends to prefer relatively high powered solid state, and frequently demonstrates them with Modwright solid state amps. Also, the Ulysses is the reference speaker that is used by Dan Wright of Modwright.

Best regards,
-- Al