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In Reply to: RE: Ditton 100 posted by gearhunter on November 25, 2007 at 07:35:51
Oops! Found them in my basement and it turns out I was wrong, it's the woofer in one of the two that is not working. The driver looks fine, no tears or anything in the surround or cone and if I push on the outside of the cone when a music signal is applied there is nothing. I thought that a blown driver usually works a little when you physically push it in a bit. Could it be something in the x-over? The tweeter on the damaged speaker works BTW. I will swap the woofer from one speaker to the other and see what happens.
Too bad, the cabinets are perfect and the other drivers work fine.
Follow Ups:
An inexpensive multimeter that can check resistance and voltages will help you run down the problem. It could be the driver (blown voice coil or broken lead wires) or the crossover. If you're lucky there is simply a bad part on the crossover or a broken trace or solder joint that will be easy to repair. If you're really lucky, it may just be an internal wire that has become disconnected.
However, run down the specific problem before you spend time worrying about what to fix.
I actually have two multi-meters. That's the good part. The bad part is I haven't the foggiest what to do with them! I suppose I set it to resistance and if the woofer doesn't have a proper reading then the driver is toast. What kind of reading am I supposed to get? Thanks.
If you set the ohm meter to the lowest scale and test an operational woofer, you should get a DC resistance of a couple of ohms. Measure the driver with it disconnected from the crossover to eliminate any influence it might have. You will also generally see the speaker cone move slightly and give a sound when you touch the meter leads to the connections. (This may vary with the meter's design.)
If the resistance is very high (thousand of ohms or higher) you probably have an open or burned out voice coil and the speaker will need replacement. If you get a reading that indicates the voice coil is working (especially if you also get a noise) then you can start looking at the crossover or other internal wiring in the box.
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