Question about Mackie SRM-450 System

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Humming problem my brand new mackie once power on gives humming sound and then for awhile it makes a thunderstorm like sound without signal and master vol. completely off.

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  • mabsterdxb Jan 31, 2009

    thanks, but this dubai we always have proper grounding..

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This could be a grounding problem, it might change if you plug it in elsewhere or it might be where you live.

Posted on Jan 29, 2009

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Repaired the LFamp: fet's and power transistors replaced. Now got the same problem: on power on a huge hum (sawtooth) for 2 seconds, and a crackling noise even with no signal fed and gain at ccw. Other speaker is OK, so no mains problem here.
Anyone?
Thanks, Specs

Posted on Dec 07, 2009

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Find images of the pin positions here:

http://www.google.com/images?hl=en&expIds=17259,27740,27760,27796,27824,27867&sugexp=leprodsca4&xhr=t&q=xlr+pins&cp=7&wrapid=tljp1291152977062014&um=1&ie=UTF-8&source=univ&ei=V271TMPdLoj2tgOK2PG7Cw&sa=X&oi=image_result_group&ct=title&resnum=3&sqi=2&ved=0CDgQsAQwAg&biw=1233&bih=570

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1 Answer

Humming speakers


If you disconnect the signal leads and the hum is away, it's probably a groundloop problem, or your equipment is generating the hum.
If it does not go away, the amps are defective

Sep 23, 2009 | Mackie SRM-450 System

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