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In Reply to: RE: stephens TruSonic, efficiency posted by blinx7 on April 08, 2014 at 08:39:35
I'm guessing that going by the Altec and JBL designs that Stephens speakers were VERY akin to, the sensitivity would be in the 95-100 db for 1 watt area.
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Wow, that would be cool if so; I was hoping they would be maybe 92 dBw. (And thus thinking maybe pushpull El34, ala dynaco, or similar...)
But upwards of 95 would let me use 3ooB or similar, SE.
Shrugging my shoulders here, I guess the orthodoxy about three-way-xover (being inefficient) doesn't always hold true if the 95-and-up-dBw figure is right ....
Fact is right now I'm listening on the 2.5 rms watts out of a B&O Beosystem boombox thing, and there is plenty of loud going on....
If you're matching them with a tube amp, efficiency is less an issue than the impedance curve. Ideally you're looking something that stays above 4 ohms and is fairly stable. I'm guessing they'd be somewhat friendly, but as I've said, that's only a guess.
I forgot to add that Tom may have some insight in regard to impedance of this design if it's a knock off of JBL,etc.
Yep, the other part of efficiency. 8 ohm is specified, but as you point out it's the full response curve not the nominal rating.
As mentioned, I'm temp-powering this with a B+O boombox that supplies a known 2.5 wrms to a four ohm tap, and no shortage of spl., so...
(I have a hard time believing the B+O has got all that much grunt, so it would seem that the Stephens/Tru are pretty efficient.)
This wknd I'll try my (kt88) tube amp from another system and that one gives a switchable 5w 'triode' or 8w ultralinear, so I can probably make better guesses then.
The triode-wired-pentode version of that one definitely wilts under a tough load, and really needs maybe 98 dBw to do its work, so that will be a good test. Fairly certain about the UL configuration working well, though, since that seems to drive anything north of 90 dBw.
I think you'll be fine. Most solid state receivers back in that era weren't keen on sub 4 ohm loads either, yet people drove speakers similar to yours for hours at high volumes with the average Pioneer or Sansui.
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