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NNTP-Posting-Date: Thu, 21 Nov 2002 10:58:59 -0600
Subject: Re: Woofer repair
Date: Thu, 21 Nov 2002 12:09:31 -0500
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> your woofer seems ok to me, but not your knowledge...
> The function generator has probably 50 Ohms impedance. Now when the woofer
> has 5.5 Ohms DC-resistance, at low frequencies this is a 20dB divider, (at
> the woofer terminal there is only 1/10th of the open circuit voltage).
> With higher frequency there is the resonance of the woofer. At this point
> might have without enclosure around 50 Ohms impedance, so you have now 5
> times the voltage across it than before.
> At higher frequencies the impedance goes down again to nearly the same
> as the beginning.
> I advise a good book:
> Joe D'Appolito: "Measuring Loudspeakers"
I put it on a function generator because in the cabinet the woofer was
breaking up with music and obviously defective.
I'm looking at this in free air....the function generator is fine.....giving
it a sine wave and it performs fine at everything above and below 40-120hz.
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