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In Reply to: RE: Were those DWs directly driven? posted by Lew on January 06, 2014 at 11:13:37
It is the insulation...at 7KV you only need like 30 mA to put 200 watts on the panel. so even if the cable serial resistance wold be 10 ohms the voltage drop on the cable would be negligible, a bigger problem would be the characteristic impedance of the cable at the higher frequencies. but that is all resolvable and a simple engineering problem. It would drive the cable nuts even more nuts that one could not change speaker cables :), In any case i would make such amps mono blocks with short cables connected to the backplate with a connector that would shut the apm down if the cable is disconnected, and would not allow physical removal till the panel is fully discharged. I know it would need some sort of control in the backplate. all that is solvable and can be made totally safe, the question is how much of an improvement would one get, and how much would it cost to build.
dee
;-D
True terror is to wake up one morning and discover that your high school class is running the country.
quote by Kurt Vonnegut
Follow Ups:
No disagreement that it's voltage, not current.
The company in Europe that also makes a dd amplifier for ESLs is Inoxx or Innoxx. Something like that. They do think in terms of an externally mounted amplifier, and they do use short thick wire and some very interesting connectors that are probably safe with the very high voltages involved. Still, it's no wonder that ESL-makers shy away from direct-drive in the US. (For that matter, EU safety rules are even stiffer than here, altho the lawyers there are not as interested in liability claims as they are here.)
is only 3000 V pp. so that is way below what is needed...they list a 5000 v pp but no info on the site...
dee
;-D
True terror is to wake up one morning and discover that your high school class is running the country.
quote by Kurt Vonnegut
I've emailed them on the subject of driving Sound Labs. I did get one or two responses that each stimulated me to ask more questions. Finally, the line went dead. No response to my last question, sent about 3 months ago. I was asking about their higher voltage amplifier.
At the outset, they had a complete misconception of how the Sound Labs work, telling me that they were a 3-way speaker. I then had to describe the circuit, etc.
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