tom1946 Posted March 7, 2016 Share Posted March 7, 2016 Hi guys, In my little music room I have my Imac and about 7 feet away my Markbass CMD 151 combo, when the mac is on and I want to rehearse a tune it's very difficult because it sets off a crackling on my E string when I play it, there is a little bit on the A string and nothing on the D or G, it;s a lot like interference on a radio with a bad signal. If I turn the mac off the interference goes so it must be the mac causing it. Not a lot of use when playing along with a song! If I move the amp to another room the problem goes away. Seems to be getting worse. Anyone come across this before? Thanks for any help. tom. Quote Link to comment Share on other sites More sharing options...
tom1946 Posted March 11, 2016 Author Share Posted March 11, 2016 As usual I seem to be the only person that's come across this problem Quote Link to comment Share on other sites More sharing options...
neepheid Posted March 11, 2016 Share Posted March 11, 2016 [quote name='tom1946' timestamp='1457675461' post='3000825'] As usual I seem to be the only person that's come across this problem [/quote] Is it the combo or the bass which is picking up the interference? Keep the combo where it is, and play the bass far away from the iMac? Have you tried leaving the combo physically where it should be but getting the power from somewhere else in the house (like where you plugged it in and had no trouble) via an extension cable? Just trying to get a handle on whether or not the problem is coming through the mains or through the air. Dunno what that means but I'd spray permutations at the problem to try and narrow it down. Quote Link to comment Share on other sites More sharing options...
Oldboy Posted March 12, 2016 Share Posted March 12, 2016 Is the IMac a laptop? If so, disconnect the power from the wall socket and run it on battery. This should identify if the problem might be the adaptor for the iMac, or the iMac itself. If it's not a laptop, swap out the power lead anyway! Check the ring mains connections into the wall sockets. The problem only occurring on certain strings does kinda point to an rf problem, interestingly enough. I suspect something might be about to blow..... Congrats by the way. You took my forum cherry! :-o Quote Link to comment Share on other sites More sharing options...
MoonBassAlpha Posted March 12, 2016 Share Posted March 12, 2016 I've had 2 instances recently of capacitors blowing in switched mode power supplies though they were cheap types, but both now work with replacement caps. Quote Link to comment Share on other sites More sharing options...
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