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Blown crossover I pulled that crossover out and one of the resistors (?) is halfway disconnected from the circuit board with one end blown off. The rubber housing of this component is partially melted away.

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Sounds like the crossover is smoked. Unusual, but it happens. Just call a Peavey service center for the part number and you should be able to order direct from Peavey. If you have problems getting the number, let me know and I'll try and get it for you.

Dan

Posted on Aug 18, 2008

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One of my polk audio RT800i tower speakers began smoking while watching tv I quickly disconnected it and it no longer works. how can it be fixed?


Since they're not self powered I wonder how much audio power they were absorbing at the time or maybe how mouch distortion, as THAT kills speakers faster than clean power. The only things that can burn up are the crossover and the individual drivers. I can't find anything about a fuse, which almost certainly would be blown, or should have. A blown crossover probably wouldn't affect the woofers. You COULD access each driver and test each with an ohmmeter for dead short or infinity.


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...OK, firstly crossovers are normally in the speaker encloures themselves so this should not really be in this catagory and secondly, give us some more info. Amplifier brand and model number. Speaker Brand and model number, any ratings of watts or ohmage...
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Look for low valued resistors that may look ok, but be open. Check the emitter resistors (.22 or .47 ohms). Check the transistors in the driver circuit as well.
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I know that a couple of you have had the same problem with the blowing 0.47 ohm resistors. I had responded quite a wile back, but forgot to make any updates. Kostiko is correct about the problem relating to these two 0.47 ohm resistors being blown. In my case on two different Haman Kardon models, this was true, but there could also be another issue. What i have found is even after replacing these resistors, the problem appeared to still be there. What was happening was that right after turning the receiver on, the resistors would blow again. What you need to do is replace the two small ceramic disc style capacitors on the same pcb as the fusible resistors, as they could be shorted as in my case. You could remove these capacitors completely, or replace them with a similar size of the same type, as they are really just there for filtering higher frequency noises from the power supply. You can check them with your multimeter first. They shouldn't shorted even in situe. I forget the size, but they are approximately 100 nano farads. Good luck. I have done this to my AVR135, and it has been running great for about 6 months now.

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