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Components and Circuits For discussions about component types, alternatives and availability, circuit configurations and modifications etc. Discussions here should be of a general nature and not about specific sets.

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Old 3rd Mar 2024, 2:53 pm   #1
OldTechFan96
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Default Replacing a High Resistor In a Speaker Crossover

I've been wanting to rebuild the crossovers in a pair of KEF Cadenzas for a while now. I bought these for little money two summers ago so I did not mind paying £30 for a new set of capacitors from Falcon Acoustics.

There is one 10ohm resistor in each crossover. It is marked: 10R J/H GWT-3.

One of these resistors has risen to 1.2Kohm and needs to be replaced.

Is there any specific type of resistor I need? Wirewound? Wattage?

Would something like this do?

https://www.esr.co.uk/components/pro...-resistors.htm

Thanks in advance!
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Old 3rd Mar 2024, 6:57 pm   #2
lesmw0sec
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Default Re: Replacing a High Resistor In a Speaker Crossover

Anything which meets the wattage and resistance spec. will do fine. At a guess, that looks like a 5W component.
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Old 3rd Mar 2024, 8:02 pm   #3
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Default Re: Replacing a High Resistor In a Speaker Crossover

If you're not pushed for space, go up on wattage. You have prime evidence that they can work a bit too hard for reliability.

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Old 3rd Mar 2024, 8:33 pm   #4
OldTechFan96
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Default Re: Replacing a High Resistor In a Speaker Crossover

Thanks for the replies.

Space is limited on the SP1019 boards. Especially since the new 100V capacitors are bigger than the original 50V parts.

I'll buy two 5W and two 3W resistors and see how they are for size.
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Old 19th Apr 2024, 8:27 pm   #5
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Default Re: Replacing a High Resistor In a Speaker Crossover

I eventually decided to fit 5W resistors in place of the smaller originals.

The crossover PCB is a bit 'busy' with the larger components but it still fit inside the cabinet.

I can't hear any difference but I'm happy I got things sorted.
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Old 19th Apr 2024, 11:38 pm   #6
Craig Sawyers
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Default Re: Replacing a High Resistor In a Speaker Crossover

The only thing I'd do is follow KEF's example with the inductors, and tie the new parts to the board with something.

It is a single sided SRPB board, and vibration from the drive units might well break the connection of one of the new ones loose.

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