Originally Posted by
Barry
Yes, I know of the Acoustats. There were several teething problems if I recall. Never actually heard any, but they were on my radar.
These days were I to replace my Quads it would be with something from Martin Logan, or possibly Ed Saunders. Many years ago I heard some Dutch manufactured ESLs at an audio fair in London. They were superb (I can't remember the name, think it had "-stat" in t), but I have heard there were reliability problems. Not sure if they are still made.
I'm not aware of anyone currently making direct drive ESLs, so there must be a reason. Reliability, EU Health and Safety rulings, .... ?
If you were to design a valve anode coupled amplifier for ESLs, what would you choose for the valve?
I heard the Acoustats once and was impressed! Was "Audiostatic" the name of the Dutch company? I'm not sure but also remember them.... Then there was the B&W DM70 treble driver, Shackleton or something similar treble units, the Indian Cadence units etc...
Health and safety would be a major problem with full range, also full SPL range, directly driven ESL's yes and one of the biggest cost implications if they were to be safe. High quality, safe, reliable and hum free 10KV PSU's don't come cheap either!
I didn't have a specific valve type in mind but was thinking in terms of transmitter valves which can routinely take 10KV and would be just ticking over delivering 2000WPC @ 10,000V for the bass panels and should last years. "Little" things like 845's should just about suffice for the treble panels
I had in mind something about the size of a door here BTW...
The possibility of "Motional feedback" here could not be ignored either! We have the possibility of a speaker capable of less than 0.05% THD across the full audio bandwidth and flat +/- 1dB or better from 20Hz - 20KHz... A quantum leap in performance!
As an engineer I'd love the challenge of such a thing, the electronics side of it anyway, but alas for someone like myself it would need guaranteed customers before R&D was even started... it could bankrupt even a 10 man company to put that much into R&D and then not sell any!
Last edited by Arkless Electronics; 06-02-2017 at 16:47.
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