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In Reply to: RE: Autoformer and shunt resistor posted by Boli46 on April 26, 2023 at 03:50:04
Oh... are you so sure about that? I've lost the paper, but I was under the impression that the value of the reflected resistance for a given attenuation is always the same from one autoformer to another, no matter who makes the autoformer, and for a 8 ohms driver / 8 ohms crossover, you need a 16Ohms resistor in // for the crossover to see 8 ohms with -3dB attenuation...
Follow Ups:
I'm not sure about anything when it comes to loudspeakers, but when I bought a pair of Crites 3636 AVCs some years ago I went through the supplied connection paper very carefully to try to understand what was going on. Unlike you I have kept the paper for reference, but I'm away from home at the moment and can't lay my hands on it. I tried the Crites website yesterday, ithe paper used to be available for downloading there, but I couldn't find it. Possibly because the website is under reconstruction. I use 16 Ohm drivers in my speakers and IIRC, a 16 Ohm shunt resistor would be required for 12 dB attenuation according to the Crites paper.
12 dB would be a turns ratio of 4:1, which is an impedance ratio of 16:1; in other words the primary impedance with a 16 ohm load would be 256 ohms. The appropriate shunt resistance would then be 17.07 ohms; the closest 5% values are 16 and 18 ohms.
3dB would be, by the same calculation, an impedance ratio of 2:1, or a turns ratio of the square root of 2. The appropriate shunt resistor would be 32 ohms for a 16 ohm load, or 16 ohms for an 8 ohm load.
Thanks Paul, I'm eagerly waiting for my 16 ohms resistors to arrive. Hopefully it solves the problem.
Seems I was wrong. Sorry for wasting everybody's time.
No time wasted here! You made me doubt which had me looking deeper into it. It's all good ;-) that's how we learn!
No apologies needed; we all come to these forums to share what we know and learn what we don't. Sometimes it's hard to tell the difference. :^)
Still, this is a bit embarrasing. I shouldn't have trusted my not infallble memory.
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