Question about KEF Audio PSW 2150 Speaker
I have e-mailed KEP Tech Support and am not optimistic for a happy answer. It sounds like amp clipping or some kind of issue inside the amp, but I cannot get it to stop. It was intermittent at first but is now constant. It happens with and without the sub cable connected and changing the levels and settings on the back panel does not change or diminish the buzzing. I have tried powering off and will next venture inside the back panel although I am not qualified for electrical repair beyond fuse replacement or other simple troubleshooting.
Actually there are several causes for this problem. The two mains 12000uf cap need to be checked, there should be about 52v+ and 52v- on the supply rails. Another area to look at is the is the 47uf capacitor c52, this is the reference on PSW2000, which is basically the same. Change these components to 105 degree types. The problem is common due to the unit being on constantly. A better idea would to connect the mains lead to the aux power out on the main system amplifier.
Posted on Jan 12, 2010
One of the things that may cause such buzzing is a fault at the filter electrolytic capacitor (could be the main one or one of them), it may behave that way if it has a partially or totally desoldered contact pin, if the pin is broken (torn away from the cap) or if the contact of at least one of the two pins has been broken somewhere inside the capacitor.
This may often happen if the capacitors are not glued to the curcuit board which means their body will vibrate when the sub is playing at a level loud enough to shake the internal components - the vibrations may cause a soldered pin to loosen the solder around it or even the pin itself to be broken or torn away from the capacitor.
Posted on Oct 01, 2009
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Posted on Jan 02, 2017
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