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In Reply to: RE: Summertime Blahs posted by drlowmu on July 19, 2014 at 07:06:20
Since you asked, no amp work lately.
811B.
Been practicing measuring acoustics of speakers with ARTA.
Goofing around with x-overs, Zobel, notch filters, driver compensation, etc.
An interesting diversion from SE tube amps.
Hats off to you and Dennis if you guys got the Altec's dialed in right.
Follow Ups:
Dennis has owned at least two movie theatres in his life and set up scores more. The last one he owned had EIGHT A7-800s behind the screen, and he had it very right. I can guarantee you, he needed no NOTCH filters, Zoebels, etc, just a stock crossover with upgraded film caps and improved wiring.Maybe you should talk to him, ever have ??
Jeff Medwin
Edits: 07/20/14
I only have the 811B.The compression driver I got has an odd impedance vs. Hz plot.
It can benefit from a Zobel to flatten the impedance curve.
Since I only have a 12" woofer that is about 97dB measured with ARTA, the horn needed a compensation circuit to bring down the midrange to level match the highs better.
A lot of people get the Altec horn and use non-Altec drivers to build a system or experiment.
If I make some screw ups or wrong turns along the way, who cares?
I am having a lot of fun learning new things and that is what matters to me.
Edits: 07/20/14
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