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| MEC Hum -grounding problem? [message #79884] |
Sun, 11 February 2007 12:20  |
emarenot
Messages: 345
Registered: June 2005
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Senior Member |
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Very strange, my MEC seems to be generating some hum, like 60hz
ground-problems stuff. Even when the thing is unplugged, I still get the
hum. The only time it goes away is when I unplug the audio cables running
from the monitor outs to the mix board. I hate to say it, but the cables
are unbalanced instrument cables. Unplugged from the MEC, but still hooked
into the board there is no hum, plugged back into the MEC -hum. Does this
make sense -even when the power cord from the MEC is unplugged? The only
thing I can think is to get some balanced cables, but if the cables
(unplugged from the MEC) create no hum, will balanced cables solve the
problem? I'm stumped --unless its some energy from the galactic core,
washing over my home town and somehow tuned to the frequency of the MEC -now
that would make at least SOME sense :-)
Thanks for any feedback,
MR
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<DIV><FONT face=3DArial size=3D2>Very strange, my MEC seems to be =
generating some=20
hum, like 60hz ground-problems stuff. Even when the thing is =
unplugged, I=20
still get the hum. The only time it goes away is when I unplug the =
audio=20
cables running from the monitor outs to the mix board. I hate to =
say it,=20
but the cables are unbalanced instrument cables. Unplugged from =
the MEC,=20
but still hooked into the board there is no hum, plugged back into the =
MEC=20
-hum. Does this make sense -even when the power cord from the MEC =
is=20
unplugged? The only thing I can think is to get some balanced =
cables, but=20
if the cables (unplugged from the MEC) create no hum, will balanced =
cables solve=20
the problem? I'm stumped --unless its some energy from the =
galactic core,=20
washing over my home town and somehow tuned to the frequency of the MEC =
-now=20
that would make at least SOME sense :-)</FONT></DIV>
<DIV><FONT face=3DArial size=3D2>Thanks for any feedback,</FONT></DIV>
<DIV><FONT face=3DArial size=3D2>MR</FONT></DIV></BODY></HTML>
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| Re: MEC Hum -grounding problem? [message #79890 is a reply to message #79884] |
Sun, 11 February 2007 14:00  |
Mike Audet
Messages: 294
Registered: December 2008
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Senior Member |
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Hi Mike,
My guess would be that you've got a ground loop between your computer and
the mixer. If this is the case, balanced cables won't help. Have you tried
the ground compensate buttons on the back of the MEC to see if one setting
or other resoves it? Are your computer and mixer plugged into the same outlet?
I've had very few ground problems with my MECs, so it definitely doesn't
have to be this way.
Hope this helps,
Mike A.
"Mike R." <emarenot@yahoo.com> wrote:
>
>
>Very strange, my MEC seems to be generating some hum, like 60hz
>ground-problems stuff. Even when the thing is unplugged, I still get the
>hum. The only time it goes away is when I unplug the audio cables running
>from the monitor outs to the mix board. I hate to say it, but the cables
>are unbalanced instrument cables. Unplugged from the MEC, but still hooked
>into the board there is no hum, plugged back into the MEC -hum. Does this
>make sense -even when the power cord from the MEC is unplugged? The only
>thing I can think is to get some balanced cables, but if the cables
>(unplugged from the MEC) create no hum, will balanced cables solve the
>problem? I'm stumped --unless its some energy from the galactic core,
>washing over my home town and somehow tuned to the frequency of the MEC
-now
>that would make at least SOME sense :-)
>Thanks for any feedback,
>MR
>
>
><!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
><HTML><HEAD>
><META http-equiv=3DContent-Type content=3D"text/html; =
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><META content=3D"MSHTML 6.00.2800.1555" name=3DGENERATOR>
><STYLE></STYLE>
></HEAD>
><BODY bgColor=3D#ffffff>
><DIV><FONT face=3DArial size=3D2>Very strange, my MEC seems to be =
>generating some=20
>hum, like 60hz ground-problems stuff. Even when the thing is =
>unplugged, I=20
>still get the hum. The only time it goes away is when I unplug the =
>audio=20
>cables running from the monitor outs to the mix board. I hate to =
>say it,=20
>but the cables are unbalanced instrument cables. Unplugged from =
>the MEC,=20
>but still hooked into the board there is no hum, plugged back into the =
>MEC=20
>-hum. Does this make sense -even when the power cord from the MEC =
>is=20
>unplugged? The only thing I can think is to get some balanced =
>cables, but=20
>if the cables (unplugged from the MEC) create no hum, will balanced =
>cables solve=20
>the problem? I'm stumped --unless its some energy from the =
>galactic core,=20
>washing over my home town and somehow tuned to the frequency of the MEC
=
>-now=20
>that would make at least SOME sense :-)</FONT></DIV>
><DIV><FONT face=3DArial size=3D2>Thanks for any feedback,</FONT></DIV>
><DIV><FONT face=3DArial size=3D2>MR</FONT></DIV></BODY></HTML>
>
>
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| Re: MEC Hum -grounding problem? [message #79892 is a reply to message #79884] |
Sun, 11 February 2007 14:49 |
gene lennon
Messages: 565
Registered: July 2006
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Senior Member |
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You say: “Even when it is unplugged”. Do you have other analog or digital
cables plugged into the MEC when you try this? Is it in a metal rack? Your
unwanted ground reference could be coming from other places than the power
ground.
Gene
"Mike R." <emarenot@yahoo.com> wrote:
>
>
>Very strange, my MEC seems to be generating some hum, like 60hz
>ground-problems stuff. Even when the thing is unplugged, I still get the
>hum. The only time it goes away is when I unplug the audio cables running
>from the monitor outs to the mix board. I hate to say it, but the cables
>are unbalanced instrument cables. Unplugged from the MEC, but still hooked
>into the board there is no hum, plugged back into the MEC -hum. Does this
>make sense -even when the power cord from the MEC is unplugged? The only
>thing I can think is to get some balanced cables, but if the cables
>(unplugged from the MEC) create no hum, will balanced cables solve the
>problem? I'm stumped --unless its some energy from the galactic core,
>washing over my home town and somehow tuned to the frequency of the MEC
-now
>that would make at least SOME sense :-)
>Thanks for any feedback,
>MR
>
>
><!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
><HTML><HEAD>
><META http-equiv=3DContent-Type content=3D"text/html; =
>charset=3Diso-8859-1">
><META content=3D"MSHTML 6.00.2800.1555" name=3DGENERATOR>
><STYLE></STYLE>
></HEAD>
><BODY bgColor=3D#ffffff>
><DIV><FONT face=3DArial size=3D2>Very strange, my MEC seems to be =
>generating some=20
>hum, like 60hz ground-problems stuff. Even when the thing is =
>unplugged, I=20
>still get the hum. The only time it goes away is when I unplug the =
>audio=20
>cables running from the monitor outs to the mix board. I hate to =
>say it,=20
>but the cables are unbalanced instrument cables. Unplugged from =
>the MEC,=20
>but still hooked into the board there is no hum, plugged back into the =
>MEC=20
>-hum. Does this make sense -even when the power cord from the MEC =
>is=20
>unplugged? The only thing I can think is to get some balanced =
>cables, but=20
>if the cables (unplugged from the MEC) create no hum, will balanced =
>cables solve=20
>the problem? I'm stumped --unless its some energy from the =
>galactic core,=20
>washing over my home town and somehow tuned to the frequency of the MEC
=
>-now=20
>that would make at least SOME sense :-)</FONT></DIV>
><DIV><FONT face=3DArial size=3D2>Thanks for any feedback,</FONT></DIV>
><DIV><FONT face=3DArial size=3D2>MR</FONT></DIV></BODY></HTML>
>
>
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| Re: MEC Hum -grounding problem? [message #80002 is a reply to message #79884] |
Tue, 13 February 2007 16:21 |
emarenot
Messages: 345
Registered: June 2005
|
Senior Member |
|
|
This is a multi-part message in MIME format.
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charset="iso-8859-1"
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Just wanted to thank Mike and Gene for their assistance.
It seems the problem is resolved. I realized that I didn't have the entire
system grounded to one point. Once I fixed this all the hum problems
disappeared. Now back to music.
MR
"Mike R." <emarenot@yahoo.com> wrote in message news:45cf5006$1@linux...
Very strange, my MEC seems to be generating some hum, like 60hz
ground-problems stuff. Even when the thing is unplugged, I still get the
hum. The only time it goes away is when I unplug the audio cables running
from the monitor outs to the mix board. I hate to say it, but the cables
are unbalanced instrument cables. Unplugged from the MEC, but still hooked
into the board there is no hum, plugged back into the MEC -hum. Does this
make sense -even when the power cord from the MEC is unplugged? The only
thing I can think is to get some balanced cables, but if the cables
(unplugged from the MEC) create no hum, will balanced cables solve the
problem? I'm stumped --unless its some energy from the galactic core,
washing over my home town and somehow tuned to the frequency of the MEC -now
that would make at least SOME sense :-)
Thanks for any feedback,
MR
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charset="iso-8859-1"
Content-Transfer-Encoding: quoted-printable
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<HTML><HEAD>
<META http-equiv=3DContent-Type content=3D"text/html; =
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<STYLE></STYLE>
</HEAD>
<BODY bgColor=3D#ffffff>
<DIV><FONT face=3DArial size=3D2>Just wanted to thank Mike and Gene for =
their=20
assistance. </FONT></DIV>
<DIV><FONT face=3DArial size=3D2>It seems the problem is resolved. =
I realized=20
that I didn't have the entire system grounded to one point. Once I =
fixed=20
this all the hum problems disappeared. Now back to =
music.</FONT></DIV>
<DIV><FONT face=3DArial size=3D2>MR</FONT></DIV>
<BLOCKQUOTE dir=3Dltr=20
style=3D"PADDING-RIGHT: 0px; PADDING-LEFT: 5px; MARGIN-LEFT: 5px; =
BORDER-LEFT: #000000 2px solid; MARGIN-RIGHT: 0px">
<DIV>"Mike R." <<A=20
href=3D"mailto:emarenot@yahoo.com">emarenot@yahoo.com</A>> wrote in =
message=20
<A href=3D"news:45cf5006$1@linux">news:45cf5006$1@linux</A>...</DIV>
<DIV><FONT face=3DArial size=3D2>Very strange, my MEC seems to be =
generating some=20
hum, like 60hz ground-problems stuff. Even when the thing is =
unplugged,=20
I still get the hum. The only time it goes away is when I unplug =
the=20
audio cables running from the monitor outs to the mix board. I =
hate to=20
say it, but the cables are unbalanced instrument cables. =
Unplugged from=20
the MEC, but still hooked into the board there is no hum, plugged back =
into=20
the MEC -hum. Does this make sense -even when the power cord =
from the=20
MEC is unplugged? The only thing I can think is to get some =
balanced=20
cables, but if the cables (unplugged from the MEC) create no hum, will =
balanced cables solve the problem? I'm stumped --unless its some =
energy=20
from the galactic core, washing over my home town and somehow tuned to =
the=20
frequency of the MEC -now that would make at least SOME sense =
:-)</FONT></DIV>
<DIV><FONT face=3DArial size=3D2>Thanks for any feedback,</FONT></DIV>
<DIV><FONT face=3DArial =
size=3D2>MR</FONT></DIV></BLOCKQUOTE></BODY></HTML>
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