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Old 8th January 2013, 08:15 PM   #1
woZa is offline woZa  United Kingdom
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Default Help identifying / sourcing a part please

Hi all.

The below part has gone on one of my crossovers (from dBTechnologies Opera 302 Lyrics - passive speakers).

I think it's a resistor but not absolutely sure! The tweeter isn't working anyway and I've traced it to this part.

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The good one measures 6 Ohms. There are no markings of any sort on the item in question.

Many thanks in advance...
A
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Old 8th January 2013, 08:25 PM   #2
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It looks like a polyswitch, but if the good one is 6 ohms then perhaps not (or what you think is good is also almost dead). Polyswitches normally have a resistance well below 1 ohm.

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Old 8th January 2013, 09:21 PM   #3
woZa is offline woZa  United Kingdom
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Thanks for your reply. I suppose if this one is bad then the other one could be on the way out too...

Any idea on the spec I would need for new ones?

Thanks again...
A
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Old 8th January 2013, 09:37 PM   #4
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Ya that sure does look like a polyswitch. Can't see that being a resistor when they already have sand casters in there.

It also looks like a disc cap but...
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Old 8th January 2013, 10:24 PM   #5
woZa is offline woZa  United Kingdom
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Thanks. So any ideas what spec replacement part I would need as there are no markings on them...

Thanks in advance
A
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Old 9th January 2013, 06:03 AM   #6
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Jaycar Electronics - Search Results for polyswitch

Do you really need them? you could just try bridging with a wire
I have used them but in the end I really see no great benefit
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Old 9th January 2013, 06:57 AM   #7
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They are invaluable if you have parties where the guests invariably crank up the amp to far Saves your tweeters from blowing. Wish I'd known about them when I was lugging my speakers to parties on a regular basis

follow moondogs link and have a look at various ones, bearing in mind the power rating and nominal impedance of your tweeters. eg if you have an 8 ohm tweeter rated at 10W look for a polyswitch that will trip out around that value.

Check if the device is in series with the tweeter, if it is then the chances it is a polyswitch increase a lot

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Old 9th January 2013, 07:14 AM   #8
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Party speakers for tweeter protection, YES with emphasis but otherwise not really needed I must admit to using them when I first started building speakers, probably work best with lower order XOs closer to the tweeters Fs ( Educated guess)
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Old 9th January 2013, 10:47 AM   #9
woZa is offline woZa  United Kingdom
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Thanks for the input... As the speakers are in a dance studio and people regularly plug / unplug iPods without turning the gain on the mixer down & crank up the volume I think it best to leave the protection in place...

I'll have a look at the speaker rating then try to find something suitable...

Thanks again
A
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Old 9th January 2013, 10:48 AM   #10
woZa is offline woZa  United Kingdom
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And yes, they are in series with the tweeters...
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