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Posted by François Blais (18.104.22.168) on September 02, 2002 at 09:37:30:
In Reply to: somebody who knows about equipment ,help!! posted by rory on September 02, 2002 at 09:24:12:
: Can somebody please explain to me what is meant by high impendence of the realist pick up??
: i have never understood it .does the amp i use also have to be high impendence?i use an swr workingman's 15.is that a bad combination?
All piezos have a high impedance. It's an electrical characteristic, similar to resistance.
The amp input must have an high impedance too, so that the piezo crystal is not loaded, to get the most linear frequency response as possible.
I don't know the input impedance of the WM15, but I suspect it's quite low.
You'd need to try a high impedance buffer/preamp to do A/B tests.
Generally speaking, most amps have an input impedance which is too low for (passive) piezo pickups, so using a buffer/preamp is adviseable.
The rule is that the impedance should be 1 megohms minimum.
(the Fishman B-II bass preamp has a 10 megohms input impedance...)
I can't help with the Accusound, sorry...
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