Does any ak'er out there have the wiring schematics for the coral bx-400 speaker? Thanks in advance for any/all help
Coral BX-400 wiring diagram
- Thread starter fixitornixit
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I've looked all over the internet for technical info on the Coral BX-400 speakers to no avail. I was given a pair a few months back & one of the two wasn't working. I pulled the back off the speaker & removed the drivers & what I found was this: Woofer- 10L-7G made in Japan (this driver needs to be re-coned) it has some weight to it, 4" mid driver very lightweight (seem in ok shape but,CHEAP), & a Realistic dome tweeter. This is my first attempt to troubleshoot & hopefully fix a speaker.
Where do I find a re cone kit for this woofer #1, #2: Should I mess with the crossover or caps? thanks, newbie in trainning
Where do I find a re cone kit for this woofer #1, #2: Should I mess with the crossover or caps? thanks, newbie in trainning
Here are a couple of photos. hope this helps. Thanks again!
Here's what appears to be the basic crossover configuration:
The woofer filter inductor has an unused tap suggesting flexibility to accommodate different woofer impedance loads -- reminiscent of some classic Bozak crossovers. It's depicted above with woofer connected to full inductance, though it might instead be connected to the reduced (tapped) inductance:
The inductor would have to be measured to verify; either with an inductance meter or an Ohm meter where path with less resistance is through the tapped connection.
Values of neither capacitor nor of the resistor are visible in the photo images. These can be edited into the schematic as they become known. It's also not clear if drivers are all connected with same relative polarity.
So what is the nature of damage to your woofers? Is it just the edge suspension surround? Or is there physical damage to cone itself, or spider , or open voice coil?
The woofer filter inductor has an unused tap suggesting flexibility to accommodate different woofer impedance loads -- reminiscent of some classic Bozak crossovers. It's depicted above with woofer connected to full inductance, though it might instead be connected to the reduced (tapped) inductance:
The inductor would have to be measured to verify; either with an inductance meter or an Ohm meter where path with less resistance is through the tapped connection.
Values of neither capacitor nor of the resistor are visible in the photo images. These can be edited into the schematic as they become known. It's also not clear if drivers are all connected with same relative polarity.
So what is the nature of damage to your woofers? Is it just the edge suspension surround? Or is there physical damage to cone itself, or spider , or open voice coil?
Thanks for the reply Stuart! I really appreciate you taking the time to provide the drawings. I have one speaker that works pretty good and the other speaker doesn't work at all. I opened the backs to check the wiring on both speakers and they are configured (and wired) identically. It looks like the previous owner installed new caps on the dead speaker though.? If I bi-pass the cross overs and give power to ea. individual driver, I do get sound. Not sure If that was a good idea or not, but I did it with very low volume & satisfied my curiosity none the less. The paper cone on the woofer of the bad speaker, I found to be very brittle and has separated from the basket or upper frame. I'll post some more photos later today.
It's also looking like I'll also be needing to purchase a few new tools (and learning how to use them). Thanks again
It's also looking like I'll also be needing to purchase a few new tools (and learning how to use them). Thanks again
