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RE: Why do electrostatics sound better after the high voltage has been on for a while?

Posted by fredtr (A) on March 17, 2021 at 17:23:57

In Reply to: Why do electrostatics sound better after the high voltage has been on for a while? posted by fredtr on March 14, 2021 at 17:52:24:

Dang, these are nice sounding speakers. I'm listening to both of them, one bass panel (out of 10) is out of one speaker, being sent to Janszen Audio to be rebuilt. I wrote to David Janszen this morning:

"My question has to do with the tweeters. The sound to me, is slightly veiled. High voltage to the tweeters is about 15% lower than spec, the 22M resister on the high voltage board reads just under 20M. Voltage to the bass panels is correct. High voltage has been on for 48 hours. My questions is should I send you the tweeters to be refurbished? Is there some problem that you can resolve that causes the mids and highs to be a bit muted?"

David got right back to me:

"While running pink noise, connect and disconnect the tweeter's bias terminal. If the sound droops fast without the connection, there's a leakage path in the tweeter requiring a rebuild. The 15% reduction itself will of course cause a couple of dB loss, could be caused by a leakage path loading the supply or endemic to the supply. Both effects however should be spectrum wide, not dulling the response.

Some were built with a damping layer incorrectly applied to the front of the tweeter and this will dull the sound. Just tear it off if so. "

And he was correct, one of the speakers tweeter did have the damping layer. I'm now listening to them, like they are near field monitors and I like them a lot. I'm going to let them play for a few more days then A/B them against ESL-63's and Yamaha NS1000M's.

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