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In Reply to: RE: It was a 70's thing posted by E-Stat on January 26, 2016 at 10:40:12
A lesson regarding familiarity. In the late 1980s I joined an audio club, and had owned the DQ-10s for maybe ten years. A member was going on vacation for a couple of weeks, and offered me his Vandersteen 2C speakers to use while he was gone.
After listening to them for a couple of weeks, I put the DQ-10s back in the system because it was time for the Vandersteens to return home. I practically ran to the Dahlquist tweeter controls to turn them down as far as possible. Prior to that, I had grown accustomed to the rather bright piezos, and only really took notice of them after the comparison to the Vandersteens.
Follow Ups:
good friend of mine sold hundreds of kits replacing the dome and piezo tweeters on the Dahlquist with a single planar tweeter.
I replaced the piezos on mine with some JVC planars. Terminated the crossover section for the piezos with an 8 Ohm resistor to reduce possible interactions with the rest of the crossover, and crossed the 4 Ohm JVCs in around 12.5kHz with just a series capacitor and a fixed resistive L-pad, cutting output by about 4.5dB to match the dome tweeter. HUGE improvement in treble quality.
Some owners have removed both the piezo and its highpass section entirely, and replaced the original dome tweeter with a modern ScanSpeak unit that plays flat past 20kHz and has similar impedance/sensitivity specs to the original. Forget which ScanSpeak model.
Piezo tweets aren't ENTIRELY useless. You can hook 'em up to a small amp, and run a frequency generator set around 22kHz into the amp. DIY gopher chaser and neighborhood dog tormentor.
I found the piezos completely superfluous on the DQ-10. It's dome tweeter was not in need of extending.
I'd run and hide from those large PA speakers using banks of piezos all spitting at you at once!
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