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In the Forum: Horn-Loaded Speakers
In the Thread: Electrostatic Sub Horn

Post Subject: Electrostatic Sub HornPosted by Horn Savant on: 8/16/2010

Up to the first fold the horn is somewhat conical as seen in post #1 picture.
This picture shows the exit w/ additional angle wall (making for "corner" loading).
This has a greater (uncalculated) flare something like a compound CD horn.

Resonant F unknown but must be above operating point (used below 80hz from
an AV receiver). Resonance sounds above 100hz when you tap a Koss module
(and hear the diaphragm ring). Would be slightly different for each diaphragm element
as it varies with tension and these are old units.

Units are driven from 2 large xformers seen in pix #1 (Koss uses 2 with series secondaries
to achieve center-tapped P/P drive). I have seen the schematic for that Acoustat direct Tube drive
(uses high voltages and big P/P tubes - a bit dangerous like radio transmitter equip)

Sensitivity is still low even with increased Polarizing HV - so much so that I run it with regular LCR
spkrs (and not with the horn spkrs as the matching adj of the AV unit doesn't have enuf span
w/out a booster amp for SW signal)

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