A mate asked me to have a look at his speaker because it was emitting a high pitched buzzing noise. I took it apart and the speakers all measured OK as did the capacitors in the crossover. The only things I found wrong was a blown bulb in one of two double bulbs in parallel and one of the 15 watt resistors was 6.8 ohms instead of 4.3 ohms? But the soldering on the resistor looked like it had never been touched from new,so maybe its before or after an upgrade? I found a screw was loose in the horn tweeter surround! Would that vibrate enough to cause the problem? He told me he was driving the speakers flat out at a concert somewhere when he noticed the sound.The bodgie resistor is the top one in the photo and the blown bulb is bottom right in the left hand phot😵h I nearly forgot.The connectors to the horn tweeter were loose as well? What size bulb would I use to replace the blown one or could I use a resistor?
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The bulbs have an NTC effect and attenuate the HF at power. Usually a 12V 5Watt car bulb will be fine. Eminence use them in their crossovers to protect the horns.
Any air leak in the speaker baffle will cause squeaking/buzzing noise as will a damaged bass speaker surround.
Any air leak in the speaker baffle will cause squeaking/buzzing noise as will a damaged bass speaker surround.
I rang my mate up and asked him exactly what the speaker was doing? Then I got out of him that it wasnt working and it was at a really low volume and crackly? So I thought it must be the blown bulb because its not getting enough signal power through? So I put a 1 amp fuse across the bulb that was blown and left all the others in place. Would that be OK or should I take out all the bulbs and use the 5 watt car light?
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