[Nono]

I recently purchased two Drawmer DL241 (jack version) compressors, and
I must say I'm happy with them.
But I notice a humming sound coming from them as soon as they're
turned on, not in the audio signal though.
It sounds just like the humming from the (big) power supply of my
mixing console.
Unlike the power supply, it wouldn't be practical to place the
compressors in another room.
They are the only ones of my gear to produce this noise, even outside
the rack with nothing connected to them; the noise is coming from
inside the machine itself (its power supply?).
The noise is not too loud, but once you hear it, you keep hearing it

I was planning on buying a couple more of these, but I'm not too sure
now, as the noise seem to get amplified inside the rack and worse if
there are more of them.

Does anyone know if this is a common thing of these Drawmers, and more
importantly; IS THERE SOMETHING ONE CAN DO ABOUT IT?

Many thanks in advance,
Norman.

[Nono]

On 24 mei, 07:11, "Soundhaspriority" wrote:
"Nono" wrote in message

...





I recently purchased two Drawmer DL241 (jack version) compressors, and
I must say I'm happy with them.
But I notice a humming sound coming from them as soon as they're
turned on, not in the audio signal though.
It sounds just like the humming from the (big) power supply of my
mixing console.
Unlike the power supply, it wouldn't be practical to place the
compressors in another room.
They are the only ones of my gear to produce this noise, even outside
the rack with nothing connected to them; the noise is coming from
inside the machine itself (its power supply?).
The noise is not too loud, but once you hear it, you keep hearing it

I was planning on buying a couple more of these, but I'm not too sure
now, as the noise seem to get amplified inside the rack and worse if
there are more of them.

Does anyone know if this is a common thing of these Drawmers, and more
importantly; IS THERE SOMETHING ONE CAN DO ABOUT IT?

Many thanks in advance,
Norman.

It sounds like it has an old-fashioned linear supply. Sometimes a
transformer has a loose turn in the winding, or a loose lamination. However,
since both units do this, and the transformer is so tiny, it sounds like a
design error caused by mounting the transformer on a resonant plate. You
might take the unit apart to see if the transformer can be remounted on
rubber grommets.

Bob Morein
(310) 237-6511- Tekst uit oorspronkelijk bericht niet weergeven -

- Tekst uit oorspronkelijk bericht weergeven -

Thanks, I'll try that.
I have been experimenting with jamming pieces of eraser gum between
the cases of the Drawmers and of the gear adjacent to them, which
helped, but I think that your suggestion would be a better and more
permanent solution.

Best regards,
Norman.

[Scott Dorsey]

Nono wrote:

Does anyone know if this is a common thing of these Drawmers, and more
importantly; IS THERE SOMETHING ONE CAN DO ABOUT IT?

Call Drawmer. Acoustical hum is usually the result of the power transformer
vibrating. They may have a quick fix, like putting the transformer on rubber
isolation mounts. It may be harder, though, like installing a potted
transformer.
--scott

--
"C'est un Nagra. C'est suisse, et tres, tres precis."