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Has anybody ever replaced an entire crossover assembly (circuit board) in a Alesis Monitor One? Specifically, does the woofer need to come out, and if so, how?

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Look here:

http://www.instrumentalparts.com/crossover-pcb-board-for-alesis-monitor-one--mk-1-and-m.html

and here: http://ep.yimg.com/ca/I/yhst-15436568105612_2091_46855693

See that 8.2 mfd bi-polar and one of those white ceramic cased resistors???. Those parts feed your tweeter... One of them is bad. You can buy the board for $30 or spend a couple bucks for those parts.

http://www.mouser.com/ProductDetail/Xicon/140-NPAL100V47-RC/?qs=sGAEpiMZZMtZ1n0r9vR22WuTsnx9Abs03070dCRY8QE%3d

http://www.mouser.com/ProductDetail/Xicon/140-NPAL100V33-RC/?qs=sGAEpiMZZMtZ1n0r9vR22UhSjrTM10DE0iKGiddcDi0%3d

Put one each of the above two capacitors in parallel to make 8 mfd to replace the 8.2 mfd and it will work fine. They only cost 74 cents each. You can find the resistors as well from Mouser.com.

IF YOUR crossover is potted in a hard material, that probablly destroyed the caps. The caps would have to be encased in a foam before hard potting as the shrinkage of the potting material would crush the caps a bit and cause failure.

Posted on Feb 03, 2010

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This speaker is not an active one. This means that it hasn't integrated amplifier, so you need an external one. The cable from the amplifier goes to the speaker. Remove the woofer in order to get access at the inner parts and check these points:
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  • In case the cable from the female jacks at the back panel goes direct to the woofer, there must be the woofer destroyed or the cable disconnected. Check the cables, it's less expensive than to replace the woofer.
Post me back if there is a crossover in use or it is direct connected and any other points of interest you came up, in order to guide you further.
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