DynAudio DBM50 Monitor Speaker - loud hissing noise

[dicky96]

Hi guys
I have a DynAudio DBM50 here - it makes a loud hissing noise.

It sounds just like an FM radio with no antenna (or tuned off-station). The volume of the hissing fades up and down, sometimes drops to almost nothing then comes back loud. It occasionally makes a loud bump noise too.

It does this even with nothing connected to the audio input XLR

Any suggestions?

[madan1]

Re: DynAudio DBM50 Monitor Speaker - loud hissing noise

If it is not constant, I would put my money on bad solder joints and/or connectors.
Other thing could be failing capacitors.. they tend to change parameters with temperature change.