One of my speakers went out all at once. I've gone through a lot of speakers, & never had the bass, midrange & tweeter all go out at the same time. I decided to open it up. I found 2 wires going to the positive input. One went straight to the bass speaker, & the other wire went to the mid-range, but was broken. There was silver tape & some kind of contacts that may have been melted. There was some scorching on the fiberglass dampening. Is that some kind of weird crossover, or fusible link? There was also a tiny black cylindrical thing with 2 tiny holes in it that was loose inside. It just felt like rubber. I'm curious & would like to fix it if possible. Any ideas? I know they're not worth messing with, but I enjoy fixing things instead of putting them in the garbage, if possible. Thanks for any info, Scott
SOURCE: karaoke speaker,no woofer or midrange working, only tweeter
Hi, it's probably that the 8" woofer and the midrange of the "amped" enclosure is open. One way to test is to remove just one wire from the inside of the enclosure to the woofer or midrange in question and with the use of a continuity tester (or a VOM), check for the resistance of the coil of each the 2 speakers. Both should read anywhere from 4-8 ohms, if there's no reading (VOM needle will not move) then the coil(s) are open. In the absence of a tester, a single AAA or AA battery would do (pls. some would argue that this is not a sound practice, however this should be enough for you to be able to determine the condition of the coil(s)). With the use of the battery and a single short length of electrical wire, apply power from the battery to the terminals of the speaker, if the cone moves, then chances are it is good, if they don't then you would have to replace it. Am not sure if available in your area, but there are some trained people who can rewind the coil should a replacement speaker be not readily available. Hope this be of help. Please let us know how things turn up. Regards.
SOURCE: Tweeters & Midrange Speakers
If you have a Ohm Meter, check the resistance to the speakers. If it is very high, the speakers are burned, (or the crossover is (just capacitors, and resisters...cheap)). If it is close to 4 ohms check the wiring and connectors..to and at the speakers, most likly the receiver/amp is not blown.
SOURCE: Midrange and tweeter driver not hit the the high range.
Are u sure u haven't messed up with the polarity of the speakers while rewiring the speakers? If all is ok and only u find that the speakers are not so vibrant as the other there cud be a possibility that the coil has shifted inside the magnet and is either scratching or not aligned. Also hav a look at the crossover
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SOURCE: Internal wiring schematic for a JBL 4311 WX-A
the conductor xxx\blk is the minus or black( from speaker) the outher is positive\red pin from speaker) the woofer is bigest speaker inside is connected on the crossover at low output, tweeter at high output, if you connect wrong you can burn speakers and crossover, you can test with very low volume on amplifier.
1st connect low to woofer, it only her low freq below 500Hz like drums and bass, if connect on med out the speaker is working as handpocket old radio audio. if connect on high the speaker is like no audio out. (the woofer take about 60-75% of amp power).
2nd connect the midrange at mid output you can listen to human voice cristal clear. if connect on high output you listem like esteric female shouting.
And connect the tweeter at the empty output
Take particular attention on polarity terminals, if you exchange the polarity you have a moofle sound traped inside of speaker, and some structered box noise who may open the box panels in future.
SOURCE: With reference to a JBL 4311 WX-A speaker...
Any wire with a black stripe on in is usually negative
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