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In Reply to: RE: stephens TruSonic, efficiency posted by Mick Wolfe on April 10, 2014 at 09:02:46
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.
Follow Ups:
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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