Question about Mackie MR8 150W 8 Active Two-Way Studio Monitor MR8
If this monitor is humming without nothing connected to it, maybe the electrolytic capacitors from its power supply are bad - they are responsible for filtering the fluctuation at the output of the internal voltage rectifiers that transform the AC input voltage into a DC voltage to feed its internal amplifier.
When they fail, the supply voltage for its internal amplifier that should be flat, continuous, now presents a pulsating profile, according to the mains frequency (generally 60 or 50 Hz, depending on the country you're in). So, the output of the amplifier will be varying at the same rate, producing the humming.
Another possibility is that one internal cable connection that should be shielded is now disconnected or loose and is picking the hum from the internal power supply.
Anyway, maybe you should take it to a service center and have it checked.
Hope this info may help you!
Posted on Mar 11, 2011
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Posted on Jan 02, 2017
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