20 Most Recent KEF Audio PSW 2150 Speaker Questions & Answers

Buzzing is usally AC line noise leaking into an un-shielded cable somewhere or a floating ground. If the AC plug is reversible, try that. Sometimes the buzz is from an attached device. Make sure all audio cables are plugged in tightly at each end and routed away from or at right angles to any power cords and away from other sources of strong magnetic fields like TV's.

Disconnect the input(s) and see if it hums in the absence of an audio source. A bad audio cable shield or unwisely-routed audio cables will allow entrance of unwanted signals from external power sources, magnetic fields, even dimmer-controlled track lights.
I've also seen variable track lights induce noise but it's usually minor.

Try rotating the power cord in the wall outlet.

If it still buzzes with no cables or anything external attached there's an internal problem.

Your amplifier is bad. I sent mine to KEF in NY and they fixed it for $100 US.

Manual posted at the following link:
http://lug.demon.co.uk/kef/psw2150_user_manual.pdf

is probably faulty capacitors
you should check out this link: http://lug.demon.co.uk/kefrepair/?cat=1

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.

regards

Triarcuate

single cable from where?

More information is required to start solving your problem. (ie. your make and model of "1500W amp", the voicecoil configuration of the kicker and Audiobahn 15's, and why you want to encorprate 2 crossovers in your system)
Seems as If you have a system without a plan.
Head unit?
More info necessary to give you the best use of your components.

Either you need new high quality cables,or your amp has output filter capacitor problems.

Check main fuse or power cable.