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Re: when amp powers up it makes a buzzing noise-quite...
Probably a loose coil or bad ground in the amp itself. Contact www.audiotekx.com, ask for Jason, he can help you and is the best out there.
The problem you're having is extremely tricky to rectify, I had an amp with the same problem at it stumped multiple techs, some that had been in the business 35 years, yet Jason got it solved.
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I would check the caps on the power supply. They are rather large electrolytic capacitors that will look like they burst and/or leaking. When these die, the caps ground and the sub will make a loud buzzing sound. If you are handy with a soldering iron you can replace them yourself. Replace them with the same voltage or a little bigger and same with the size.
If the cap. says 16v 4700pF on it, for example, a 20v 5300pF or a 16v 6200mF cap. will work for this application.
yes. A good idea. Kill power to the sub, then unplug and remove everything from the sub. go ahead and plug it in again and check for buzzzz.
That is test one. if you have buzz still, its the sub assembly. bad luck, but not impossible. If the buzz is gone its one of the signals to the sub. They can produce a buzzz without any signal coming from your stereo equipment. Replace the feed line, enjoy! BTW...Kef sure does sound clean. good choice.
You need to find out if the prolem is in the power amps that drive the speakers are bad or not, Try using Powered PC speakers hooking it up to the Audio line out RCA jacks to see if you get the same problem. If it is OK then the problem is in the power amp sections, it can be bad power amp IC of bad filter capacitors in the power supply that provided power to the power amp circuits.
By chance have you tried making sure the laptop is not too close to the speakers? Sometime you will get feedback when the source is to close to high powered speakers. Also, check your jack cord and make sure no splits/cuts are visiable and the plugs are fully inserted.