When the unit is changing CD tracks there is a low level, fairly low
frequency 'blubbering' sound from all speakers. This is the only time I hear
it, and it's quiet enough that it's not objectionable. Could it be the
stepping motor is poorly filtered or something like that? Not discernable
during quiet passages in music.
TIA
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Easy's getting harder everyday

In article , "PanHandler" wrote:
When the unit is changing CD tracks there is a low level, fairly low
frequency 'blubbering' sound from all speakers. This is the only time I hear
it, and it's quiet enough that it's not objectionable. Could it be the
stepping motor is poorly filtered or something like that? Not discernable
during quiet passages in music.

Most likely ground loop artifacts or just plain ground problems.
I think many systems may produce
this to some degree. Is there a separate amp?

greg

"GregS" wrote in message
...
In article , "PanHandler"
wrote:
When the unit is changing CD tracks there is a low level, fairly low
frequency 'blubbering' sound from all speakers. This is the only time I
hear
it, and it's quiet enough that it's not objectionable. Could it be the
stepping motor is poorly filtered or something like that? Not discernable
during quiet passages in music.

Most likely ground loop artifacts or just plain ground problems.
I think many systems may produce
this to some degree. Is there a separate amp?

Hi Greg
Yeah, it's in my 'portable juke' unit. Here's a pic of some of the wiring:
http://flickr.com/photos/43996336@N00/?saved=1 I took care to get everything
right.
Joe

In article , "PanHandler" wrote:

"GregS" wrote in message
...
In article , "PanHandler"
wrote:
When the unit is changing CD tracks there is a low level, fairly low
frequency 'blubbering' sound from all speakers. This is the only time I
hear
it, and it's quiet enough that it's not objectionable. Could it be the
stepping motor is poorly filtered or something like that? Not discernable
during quiet passages in music.

Most likely ground loop artifacts or just plain ground problems.
I think many systems may produce
this to some degree. Is there a separate amp?

Hi Greg
Yeah, it's in my 'portable juke' unit. Here's a pic of some of the wiring:
http://flickr.com/photos/43996336@N00/?saved=1 I took care to get everything
right.

In troubleshooting, you basically do something and listen for results.
Stuff you can do. Increase power wiring thickness. Rerouting wiring.
Adding ferrite clamps to most any connection, including RCA
type cabling. Adding a RCA ground loop isolator in the signal
line. Turning down amplifier gain.

greg

"GregS" wrote in message
...
In troubleshooting, you basically do something and listen for results.
Stuff you can do. Increase power wiring thickness. Rerouting wiring.
Adding ferrite clamps to most any connection, including RCA
type cabling. Adding a RCA ground loop isolator in the signal
line. Turning down amplifier gain.

Thanx Greg. I've done some shooting, but it's not really a big deal (at this
point, anyway). I like the idea of the clamps and GLI. Any suggestion for
sources?

"GregS" wrote in message
...

Most likely ground loop artifacts or just plain ground problems.

Wouldn't GL artifacts manifest themselves 'all' the time?

In article , "PanHandler" wrote:

"GregS" wrote in message
...
In troubleshooting, you basically do something and listen for results.
Stuff you can do. Increase power wiring thickness. Rerouting wiring.
Adding ferrite clamps to most any connection, including RCA
type cabling. Adding a RCA ground loop isolator in the signal
line. Turning down amplifier gain.

Thanx Greg. I've done some shooting, but it's not really a big deal (at this
point, anyway). I like the idea of the clamps and GLI. Any suggestion for
sources?

R A D I O S H A C K

One more thing is to add some filtering on the power leads.
Try a electrolytic of at least 1000 mfd 16 volts across
the 13.8 volts. observe polarity. This can also be in conjunction with ferrite cores.

greg

In article , "PanHandler" wrote:

"GregS" wrote in message
...

Most likely ground loop artifacts or just plain ground problems.

Wouldn't GL artifacts manifest themselves 'all' the time?

Right but music helps to hide them, and when the CD is
just playing, its not doing much.

greg

"GregS" wrote in message
...
In article , "PanHandler"
wrote:

"GregS" wrote in message
...

Most likely ground loop artifacts or just plain ground problems.

Wouldn't GL artifacts manifest themselves 'all' the time?

Right but music helps to hide them, and when the CD is
just playing, its not doing much.

Thanks again. Between you, Graham and others, this has been an enlightening
week!