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Piezos actually come on much earlier than 4K. I tend to put them past an L-pad, and cap them off anywhere from 7-10K. Does cut he efficiency, so I use stacked vertical arrays. Trimming the flanges to close couple the horns can be useful.
Current builder of Motorola designs...
Pulsar Developments Ltd - Piezo Tweeter Application Note
Just a quick check with PCD shows that the combo of 32B and 802-8g can be made flat +/- 1.5dB from 1 to 15 kHz with a couple of caps, couple of resistors and a coil. Should be pretty consistent across +/- 30 degree window
Great article. Thanks for posting that OG.Quote:
Originally Posted by Old Guy
And thanks for the measurements Marty. I enjoy the geeky stuff!
The 2nd noteworthy innovation from Klipsch.Quote:
so I use stacked vertical arrays.
The first time i heard piezos sound good was the Klipsch array that topped the big "MC" series PA system. Of course by then i was so sick of the nasty raspy T-35 that any other tweeter in a Klipsch set-up would have been an improvement. Actually, a blown T-35 is an improvement over a working model.
Not so sure it was klipsch innovation as I and others did it years before, and "sound columns" predated that.
Tell us what you really think, Tom... :DQuote:
Originally Posted by bowtie427ss
LOL, I once saw a dual driver T-35 in an old cinema system. I wonder... if both of the drivers were blown would it be twice as good as a working t-35?Quote:
Originally Posted by bowtie427ss
The issue seems to be mostly with the t-35's horn. The T-350 uses the same diaphragm if I recall. And the ST-350 is an improvement.Quote:
Originally Posted by bowtie427ss
pretty sure the SPEAKERLAB WA4000 was a T-35 with an attempt to improve the horn, if so it worked.
Speakerlab WA4000 Tweeter Horn Wave Aperture Design from Model 7 Speaker | eBay
.....and all these decades I thought it was just my tinnitus that made me feel this way.Quote:
Originally Posted by bowtie427ss
GM