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In Reply to: RE: Speakers for 20 watt tube amps posted by airtime on July 13, 2015 at 06:34:42
The Tektons mentioned by Opus are probably your best bet in the 1K and below category. I've owned the M-Lore (around $700) and it's a solid tube friendly choice that would give you at least a 6 db advantage in efficiency plus added headroom over the SR 71 and the others you've mentioned. On the adventurous side and somewhat outside your budget ($1500) is the Spatial M3. Open baffle design, 95 db efficient, but it's a nominal 4 ohm load. Not sure if the Sherwood is comfortable with a 4 ohm load in this case.
Follow Ups:
The S5000 schematic shows 4 Ω speaker taps. The issue in mating Spatial M3s to a S5000 is what sort of dips are present in the impedance curve. Tube amps don't exhibit the gargantuan damping factors SS amps exhibit. Dips down to 3 Ω should be OK. If dips down to 2 Ω or less (particularly in the power hungry deep bass) are present, a "marriage" is (IMO) suspect.
Eli D.
Thx Eli. I've run a pair of Spatial M2 Turbos for hours using either a Latino ST 70 or Line Magnetic 218ia. That said, I have no idea if airtime would have any issues with his Sherwood. A friend with Spatial M1's also has no issue when using a LM 518ia. The stated impedance on the M series Spatials is 4 ohm nominal with low phase angle and no dips below 3 ohms. I'm guessing (and it's purely that) that it would be no worse than driving a 4 ohm Maggie, aside from the massive gain in efficiency the Spatial offers. Though it may not be the perfect "soulmate" marriage a flat 8 ohm load would present, it's doable in my experience.
That impedance curve is "flat" enough. The S5000 is not no NFB SET and should do fine on the 4 Ω taps. Thank G_D for good "iron".
Eli D.
Edits: 07/13/15
Couldn't agree more.
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