Emu XL-7 & MP-7 User's Group

Hi all,

I've posted this question a while ago, and got no replies.
But the problem hasn't gone, and I really want to do something about it.
Any hints/tips will be greatly appreciated!

So:
- the first time I mentioned phone outputs only, but actually the buzz 
is present in main outs as well;
- its' loudness is constant, not affected by master volume at all;
- this looks like a stupid grounding problem - maybe someone familiar 
with the innards of a command station has an idea *where* it can be?

Cheers!
Boris.

There are grounding issues with the command stations. I had the common 
problem with the headphone jack buzzzzzz. 
Tighning all the screws cured the probelm (or it might of been loosen 
the headphone jack nut.. or both.. cant remember)
Maybe you could try this. Its mentioned in the XL7 FAQ thats in the 
files section (i think..)
How is it plugged into your studio? ie into a desk, into a computer?? 
(that will most proberly buzz...)
Give us a bit more info and we might be able to help you more :o)
Gonz 


--- In xl7@yahoogroups.com, "gutman75" <bgutman@c...> wrote:
> 
> Hi all,
> 
> I've posted this question a while ago, and got no replies.
> But the problem hasn't gone, and I really want to do something about 
it.
> Any hints/tips will be greatly appreciated!
> 
> So:
> - the first time I mentioned phone outputs only, but actually the 
buzz 

> is present in main outs as well;
> - its' loudness is constant, not affected by master volume at all;
> - this looks like a stupid grounding problem - maybe someone familiar 
> with the innards of a command station has an idea *where* it can be?
> 
> Cheers!
> Boris.

The command station is plugged to a mixer (Mackie 1604 for that 
matter... it has its' own problems, but the buzz is definitely coming 
from the MP-7). All audio equipment is powered from the same outlet 
if that matters. However the buzz is also present in the headphones 
plugged straight to command station's phone output. Recently was 
doing something in headphones and it got really annoying - that's 
when I decided I got to do something about it.

--- In xl7@yahoogroups.com, "gonzinigonz" <gonzini@f...> wrote:
> There are grounding issues with the command stations. I had the 
common 
> problem with the headphone jack buzzzzzz. 
> Tighning all the screws cured the probelm (or it might of been 
loosen 
> the headphone jack nut.. or both.. cant remember)
> Maybe you could try this. Its mentioned in the XL7 FAQ thats in the 
> files section (i think..)
> How is it plugged into your studio? ie into a desk, into a 
computer?? 
> (that will most proberly buzz...)
> Give us a bit more info and we might be able to help you more :o)
> Gonz 
> 
> 
> --- In xl7@yahoogroups.com, "gutman75" <bgutman@c...> wrote:
> > 
> > Hi all,
> > 
> > I've posted this question a while ago, and got no replies.
> > But the problem hasn't gone, and I really want to do something 
about 
> it.
> > Any hints/tips will be greatly appreciated!
> > 
> > So:
> > - the first time I mentioned phone outputs only, but actually the 
> buzz 
> > is present in main outs as well;
> > - its' loudness is constant, not affected by master volume at all;
> > - this looks like a stupid grounding problem - maybe someone 
familiar 
> > with the innards of a command station has an idea *where* it can 
be?

> > 
> > Cheers!
> > Boris.

Taken from the FAQ in the files section..

-I have a humming sound in my headphones when they're connected to 
the Command Station, is it defective?

No, the hum can actually be caused by a few things. Sometimes after 
installing a new Sound ROM, the two halves of the Command Station 
outer cover may not be secured tightly enough. Use a philips head 
screwdriver to check that all of the screws are securely seated. Also 
check to see if the headsocket itself is securely fastened to the 
unit as that too may be an addition cause of the noise. Some users 
have reported that using a 12v lamp plugged into the unit may 
occasionally cause some minor noise in the headphones. Lastly, check 
if the ribbon cable connecting the headphone circuit board to the 
main circuit board has come loose inside the machine.

Check all your screws are tightened down etc
Gonz



--- In xl7@yahoogroups.com, "gutman75" <bgutman@c...> wrote:
> The command station is plugged to a mixer (Mackie 1604 for that 
> matter... it has its' own problems, but the buzz is definitely 
coming 
> from the MP-7). All audio equipment is powered from the same outlet 
> if that matters. However the buzz is also present in the headphones 
> plugged straight to command station's phone output. Recently was 
> doing something in headphones and it got really annoying - that's 
> when I decided I got to do something about it.
> 
> --- In xl7@yahoogroups.com, "gonzinigonz" <gonzini@f...> wrote:
> > There are grounding issues with the command stations. I had the 
> common 
> > problem with the headphone jack buzzzzzz. 
> > Tighning all the screws cured the probelm (or it might of been 
> loosen 
> > the headphone jack nut.. or both.. cant remember)
> > Maybe you could try this. Its mentioned in the XL7 FAQ thats in 
the 
> > files section (i think..)
> > How is it plugged into your studio? ie into a desk, into a 
> computer?? 
> > (that will most proberly buzz...)
> > Give us a bit more info and we might be able to help you more :o)
> > Gonz 
> > 
> > 
> > --- In xl7@yahoogroups.com, "gutman75" <bgutman@c...> wrote:
> > > 
> > > Hi all,
> > > 
> > > I've posted this question a while ago, and got no replies.
> > > But the problem hasn't gone, and I really want to do something 
> about 
> > it.
> > > Any hints/tips will be greatly appreciated!
> > > 
> > > So:
> > > - the first time I mentioned phone outputs only, but actually 
the 
> > buzz 
> > > is present in main outs as well;
> > > - its' loudness is constant, not affected by master volume at 
all;
> > > - this looks like a stupid grounding problem - maybe someone 
> familiar 
> > > with the innards of a command station has an idea *where* it 
can 

> be?
> > > 
> > > Cheers!
> > > Boris.

Unplug the MP-7 from everything except power.  See if you still have
hum in the headphones.  If you don't, try connecting things one by one
until the problem returns.  If you do have hum even when nothing else
is conneted, I'd bring the unit to a different outlet in a different
part of the house.  Try turning off halogen lamps nearby.  Also, you
could check the internal connections too, but if you're also getting
hum on the mains, it's probably not that.

-Aaron

--- gutman75 <bgutman@...> wrote:
> The command station is plugged to a mixer (Mackie 1604 for that 
> matter... it has its' own problems, but the buzz is definitely coming
> 
> from the MP-7). All audio equipment is powered from the same outlet 
> if that matters. However the buzz is also present in the headphones 
> plugged straight to command station's phone output. Recently was 
> doing something in headphones and it got really annoying - that's 
> when I decided I got to do something about it.
> 
> --- In xl7@yahoogroups.com, "gonzinigonz" <gonzini@f...> wrote:
> > There are grounding issues with the command stations. I had the 
> common 
> > problem with the headphone jack buzzzzzz. 
> > Tighning all the screws cured the probelm (or it might of been 
> loosen 
> > the headphone jack nut.. or both.. cant remember)
> > Maybe you could try this. Its mentioned in the XL7 FAQ thats in the
> 
> > files section (i think..)
> > How is it plugged into your studio? ie into a desk, into a 
> computer?? 
> > (that will most proberly buzz...)
> > Give us a bit more info and we might be able to help you more :o)
> > Gonz 
> > 
> > 
> > --- In xl7@yahoogroups.com, "gutman75" <bgutman@c...> wrote:
> > > 
> > > Hi all,
> > > 
> > > I've posted this question a while ago, and got no replies.
> > > But the problem hasn't gone, and I really want to do something 
> about 
> > it.
> > > Any hints/tips will be greatly appreciated!
> > > 
> > > So:
> > > - the first time I mentioned phone outputs only, but actually the
> 
> > buzz 
> > > is present in main outs as well;
> > > - its' loudness is constant, not affected by master volume at
> all;
> > > - this looks like a stupid grounding problem - maybe someone 
> familiar 
> > > with the innards of a command station has an idea *where* it can 
> be?
> > > 
> > > Cheers!
> > > Boris.
> 
> 
> 
> 
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how old is the building you're in?

maybe you have improperly grounded / dirty power..
i've had issues with that hauling my xl-7 over to friends to jam 
before..  sounds great at my house but buzzes plugged into thier power..

--- In xl7@yahoogroups.com, "gutman75" <bgutman@c...> wrote:
> 
> Hi all,
> 
> I've posted this question a while ago, and got no replies.
> But the problem hasn't gone, and I really want to do something about 
it.
> Any hints/tips will be greatly appreciated!
> 
> So:
> - the first time I mentioned phone outputs only, but actually the 
buzz 

> is present in main outs as well;
> - its' loudness is constant, not affected by master volume at all;
> - this looks like a stupid grounding problem - maybe someone familiar 
> with the innards of a command station has an idea *where* it can be?
> 
> Cheers!
> Boris.

--- In xl7@yahoogroups.com, "infradead" <infradead@y...> wrote:
> how old is the building you're in?

Funny you should mention that: the studio is in the old part of house, 
which is over 200 years old. At any rate, the power is notoriously bad 
in our area (recently one of my hard disks died - apparently, because 
of a voltage spike, so I'm going to get a UPS anyway). Could low-
quality power really be causing hum? If so, a UPS is supposed to help, 
right?

Thanks a lot to all who replied!
Have a nice day,
Boris.

Bad earthing, yep causes hums..
was the problem only when you connected it to you makie mixer or did it 
still do it alone with just headphones plugged in?
Like Aaron said try powering in from another socket and maybe try 
another IEC mains lead.. also those multiway extension cables can be a 
bit moody somethimes, if your using one?
You could buy one of those mains outlet fault testers that tells you 
when you have a problem. Plug it into your mains outlet and read the 
display.
Cheers
Gonz


--- In xl7@yahoogroups.com, "gutman75" <bgutman@c...> wrote:
> --- In xl7@yahoogroups.com, "infradead" <infradead@y...> wrote:
> > how old is the building you're in?
> 
> Funny you should mention that: the studio is in the old part of 
house, 
> which is over 200 years old. At any rate, the power is notoriously 
bad 
> in our area (recently one of my hard disks died - apparently, because 
> of a voltage spike, so I'm going to get a UPS anyway). Could low-
> quality power really be causing hum? If so, a UPS is supposed to 
help, 

> right?
> 
> Thanks a lot to all who replied!
> Have a nice day,
> Boris.

Power quality, which a UPS can solve, is not the issue here.  Grounding is.
If the ground is not zero volts, that is elevated or has leakage, your
equipment will have 50/60 cycles all over the place.  Even cases of the
equipment will no longer be a shield to hum but an antenna to it.

Take some measurements against a good known ground (maybe waterpipes) with
an AC voltmeter and then possible hire an electrician to reground your
wiring system.....

Bob
Corona/Riverside, CA


----- Original Message -----

From: "gutman75" <bgutman@...>
To: <xl7@yahoogroups.com>
Sent: Monday, May 09, 2005 12:59 AM
Subject: [xl7] Re: buzz in the outputs


> --- In xl7@yahoogroups.com, "infradead" <infradead@y...> wrote:
> > how old is the building you're in?
>
> Funny you should mention that: the studio is in the old part of house,
> which is over 200 years old. At any rate, the power is notoriously bad
> in our area (recently one of my hard disks died - apparently, because
> of a voltage spike, so I'm going to get a UPS anyway). Could low-
> quality power really be causing hum? If so, a UPS is supposed to help,
> right?
>
> Thanks a lot to all who replied!
> Have a nice day,
> Boris.
>
>
>
>
>
>
>
>
>
> Yahoo! Groups Links
>
>
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