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I got my first (I bought two) E2 speaker yesterday. These are of course
high impedance, perhaps 1 to 2KOhm (a guess). I checked it for continuity
(good) then hooked it across my AV receiver main left channel, leaving
my main Hafler power off turned off. I got weak sound at a high level
on the control. I loaded up a long music file in Audacity, made it mono,
and inverted the left channel. I hooked up the speaker across the two
hot terminals of my big main amp, now it sound plenty loud.
A close inspection leaves open the question of whether it has been
reconed. These things have an "open" outer cone edge, no rubber support.
A close look shows that the cone was made by wrapping a sheet of stiff paper
into a cone and gluing it together. But the attachment to the "works"
looks awfully neat, and a close inspection of the gap at the outer edge
showed lots of very very old dust and lint in it. Does anybody know if
the original cone in these was seamless or seamed?
Now as to the sound! I thought these things had a characteristic
bad sound. Not so. It just sounded like any old 12 inch or so cone speaker.
So I had Audacity generate a correctly out-of-phase-channels 100-10000 Hz
sweep and listened. There are some incredibly large resonance peaks
in the lower frequencies, at higher frequencies no big ones, just rough response.
The useful frequency range is about 150-5000 Hz. At some of the lower
frequency resonances the sound is essentially ALL distortion, some 2nd
harmonic, some third. Odd.
Has anyone else ever tested one of these? If so, is that what you heard?
What's the best web site for very old radio restoration discussions?
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