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Just wondering if anyone can assist, I have a blown 50 ohm, 5 watt resistor in my crossover and all I can find is a 47 or 56 ohm resistor, will the value difference harm my speakers or change the sound? Please let me know. Thank you
Here's a link to standard EIA values for resistors (and other passive devices). You can get a 1% resistor (E-96) at 49.9 ohm.
The real question is why did the resistor blow. Were you a bad boy and crank those babies up too high? Is your amp clipping? I wouldn't attribute to old age; hell, I'm 67 and my resistance to change is as good as ever :).
On the violin: "Heaven reward the man who first hit on the idea of sawing the innards of a cat with the tail of horse."
Yes! I moved them into a much larger room with 600wpc Pass monoblocks on them and it was just too much. This brand of speakers (Alon) uses the resistors as a driver protection mechanism. I take full responsibility for this one! Bill at Millersound has just finished the woofers as the spiders were soft as well. They should be like new again.
" I moved them into a much larger room with 600wpc Pass monoblocks on them and it was just too much."
You might consider replacing your 50 ohm, 50 watt resistor with two 100 ohm, 50 watt resistors in parallel. That will give you 50 ohms and 100 watts power handling.
Me being a dealer makes you leery?? It gets worse... I'm a manufacturer too.
If the resistors are "a driver protection mechanism" in addition to ohm rating you should give serious attention to the wattage rating of your replacement resistors.
So not only do you need to match the ohm rating of your original resistors but also the wattage rating.
Wire this up in PARALLEL not series
Your good to go with your 47ohm component
47 is 3 less than 50 & 56 is 6 more than 50. 3/50=0.06 or 3 is 6% of 50. Typically such crossover parts themselves have +,-10% deviation per value-as-marked tolerances which means the original resistor may have measured anywhere from 45 ohms to 55 ohms despite its' 50-ohm marking. So replacing a 50-ohm part with a 47-ohm part is not only OK, but within part specification. If only a 56-ohm part were available, even that will be fine but 47 is the slightly better choice of those two.
Understood, as a CPA I get the math, I just wsn't sure if a few ohms would change the signature of the speaker as this resistor is on the midrange crossover board. Many thanks, Scott
Why don't you just put two 100-ohm resistors in parallel and you will have 50-ohms? That's what I would do if I couldn't find a 50-ohm resistor.
Just re-read your message, I also need a 100 ohm as well. This may sound like a stupid question but what is the physical difference of soldering the resistors together in series or parallel? What does each way look like? Thank you again
Check out the link below.
Thank you John, I am changing all of the resistors, I actually need a 100, 50, 3 and a few 4's. The old ones are showing signs of aging! Thank you again for your assistance...
The non-inductive resistors that are recommended come in 33 ohms, so 3 of those is 99 ohms which is pretty close to the target. Is it OK to solder 3 together?
Well, I thought the target was 50-ohms. You would need six 33-ohm resistors in series parallel. However, with the internet at your disposal, I would think you could find an acceptable 50-ohm resistor. Check out the following link.
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