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In Reply to: RE: Are you referring to the Sound Labs? posted by Lew on January 01, 2014 at 12:51:06
I am just going off of good old ohms law. if you put 200 watts across 4 ohms you get a voltage swing of about 28.28V multiply that by 200 to 250 and you get the 5700 to 7000 volts :)
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:
With no audio step-up, the impedance of the panels is much, much higher than 4 ohms. In fact, I measure about 25 ohms at 1kHz using a 1:90 step-up with no RC network, which means that the intrinsic Z of the panel is way up there in the thousands. (I am thinking it would be 25R times the square of the turns ratio, or 8100 X 25.) With the Sound Lab crossover network, yes, Z is as low as 4 ohms, at certain frequencies. But even with their massive bass transformer, Z does rise at low frequencies way above 4 ohms; I think I got around 50R at 50Hz via the SL bass transformer.However, your basic premise that increasing V necessitates an increase in power, all other things being equal, is of course correct. My only point was that I do not believe Power has to be anywhere near 200W. Because, for a big enough V swing, the current demand is nominal when you're driving the panels direct.
I edited this to change "your" into "you're" (you are). An error I commonly make in a first draft.
Edits: 01/01/14
I used it as a nominal number with the crossover...i know it is not really 4 ohms and not a real impedance but rather capacitive reactance....and and and but just to estimate what would the voltage swing be on the amp and on the panel...gets you somewhere in the ballpark.
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
So my point was that 4 ohms is not the operative impedance of the panel with nothing between the stators and the amplifier outputs.
Anyway we both agree that more than a 4000V swing afforded by the RM amplifier shown in the advertisement is probably necessary to drive a Sound Lab with authority. The question is whether RM can get it up to 5 or 6kV, or whether he agrees with us that more V is needed and why.
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