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Best resistor type for speaker crossover

post #1 of 5
8/8/11 at 7:46am
Thread Starter 

Most speaker uses wirewound resistor in crossover. Is there any reason for this apart from their high power rating? Would it be technically superior if I replace them with a bunch parallel metal film or metal oxide resistor? With the later I don't even need to parallel them since they come in high enough power rating.

 

I read that metal oxide resistors are preferable for tweeter application for their low inductance. On my speaker crossover I have a bunch of inductors in it. So I guess, when inductance is not an issue wirewound resistors are superior for their lower noise?

 

I haven't traced the PCB, can I safely say that the wirewound resistor (4.7 kohms, 5W) Or is it even wirewound (it is encased in white ceramic type material)? Does wirewound come in such high resistance value? that is in there and the bunch of inductors are for the woofer?


Edited by Navyblue - 8/8/11 at 7:51am
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post #2 of 5
8/8/11 at 9:00pm

Resistor noise isn't an issue in a passive crossover, resistor noise is only a concern if it's going to be amplified.

 

A 4.7k resistor seems very high for a crossover, what sort of speaker is it?

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post #3 of 5
8/8/11 at 9:26pm
Thread Starter 

The speaker is a Jamo 507 floorstander from the 90s.

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post #4 of 5
8/8/11 at 9:41pm

I can't imagine what they are using a 4.7k resistor for, sure its not a 4.7 ohm?

 

Anyway, if replacing a wirewound, it might be best to replace it with another wirewound. Any inductance should've been accounted for in the crossover design.

 

If i was going to design my own crossover i'd try to use metal oxide, so i don't have to worry about the inductance in the design.

 

You can get 5W and 10W metal oxide resistors pretty easily, a single resistor rated to do the job is a better option than multiple smaller ones.

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post #5 of 5
8/9/11 at 12:34am
Thread Starter 

Well, it could be 4.7 ohms, I wouldn't bet my money on my memory these days.

 

Thanks for your inputs :).

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