how 'bout 109dB 2-way 511 based w. augmented bass for SE or P-P triodes?

High Efficiency Speaker Asylum

Need speakers that can rock with just one watt? You found da place.

by using a straight ~1/4 size 100Hz tractrix, exponential -> hyperbolic horn and lively 15" you can get ~108-110dB ~110Hz -> 500 or higher and use an Altec 511 or if handy a homemade tractrix HF horn - passive xover.
augmentation < 110Hz can be done simple using direct radiators with active xover and decent amp.
with the 100Hz horn running pretty much full-out I'm not sure how much excess is left for 511 to be lightly contoured - might not matter - suspect it will sound pretty good without any EQ.
(btw - my homemade parallel 2A3 amp is pretty cool but I sure wouldn't rule out push-pull triodes without any loop nfb! - might be better in some aspects than SE - usually better damping - my mod class AB1 Eico ST-70 using ppp 6BX7 @300vdc vak is very good - hard to beat those xformers)
if you've only 3 watts then something like this mess might be a consideration - you've got ~112dB up close.
Freddy

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Topic - how 'bout 109dB 2-way 511 based w. augmented bass for SE or P-P triodes? - freddyi 14:26:00 05/19/01 (0)

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