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Which resistors for crossover circuit ?

Delta Prime

Jul 29, 2020
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I have Mission 782 speakers and the 2 x 8.2 ohm crossover resistors have failed.
When looking for replacements what power / wattage specification do I need to choose ?
Better yet how could you choose the resistor wattage yourself?
 

Bluejets

Oct 5, 2014
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Difficult to say as there is nothing in your photo to "scale" the resistors...however, seem to be possibly 2w.
These days resistors tend to be much smaller physically for the same power rating.
Drawing (and lack of any info on drive amp) does not say either but being in the "tweeter" circuit, possibly small current there.
Assy looks like someone scratched up from bits.

More importantly for you, what caused the failure....???? :eek::eek:
 
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Delta Prime

Jul 29, 2020
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Jul 29, 2020
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2,114
Difficult to say as there is nothing in your photo to "scale" the resistors...however, seem to be possibly 2w.
These days resistors tend to be much smaller physically for the same power rating.
Drawing does not say either but being in the "tweeter" circuit, possibly small current there.
Power! Beat you by 1 minute. Post number two got it going on.
 

crutschow

May 7, 2021
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When looking for replacements what power / wattage specification do I need to choose ?
Measure the physical size of ones that have failed and determine the wattage of similar sized resistors from common resistor data.
Then pick ones with a least twice that wattage rating.
 

Marco Murray

Jun 10, 2017
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Thanks all.
The resistors are about 9mm long x 3mm wide.
They are for the high frequency tweeter part of the 3 way circuit.
The mid and low are still working fine.
The tweeters themselves are still working when tested independently.
As for what caused the failure I am mystified!
I have four speakers running off 2 Denon amps and the HF part of ALL 4 crossovers blew on the same night!
The amplifiers are never played at full volume because I have physically limited the volume control knobs to never go beyond 60%.
I can only guess that a track with a very loud high frequency sound was played, the source being a laptop into the Aux input.
System has had plenty of use over the years but this has never happened before.
 
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