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

I am in a situation where all my cables are packed into a road 
case.  I have all that is balanced using balanced cables but there 
still is some hum.  I think some of it is off my new mixer (alesis 
studio 12R) before this mixer i was using a mackie 1604vlz.  I think 
it had a lower noise floor.  Almost all my cables where made by me 
and are shielded and of good quality but what can i do about the 
power cables?

Any advice other than the power conditioner.
I am totaly packed for room in this box so I would have to mount it 
in the back some how.  so other than that what can I do?

Thanks for any help.

Mike G.


--- In xl7@y..., "ezra_gold" <ezra_gold@y...> wrote:
> The other thing to do is run "balanced" signals and cabling 
whenever 
> possible. This would be and XLR or 1/4in TRS wire where 3 wires 
carry 
> a monophonic signal. Balanced signals seperate ground from the 
audio 
> signal. Balanced signals are higher level (+4dbm vs -10dbm) and 
less 
> affected by electrical noise. You can also "lift" ground at one 
end 
> of the cable to prevent hum causing ground loops. 
> 
> There are conventions on how to lift ground and this is the source 
of 
> the arrows on Monster cables (which I think are bunk too but Im 
just 
> sayin....). 
> 
> You also need to be carefull when converting between unbalaced and 
> balanced signals. You need to follow the manufacturer reccomended 
> grounding and conversion practices our use a "DI box"/Impedance 
> Transformer. Pick up a good studio book it will explain things 
> better. 
> 
> On the xl-7 the main outs are balanced but the subs are not. Using 
> a "guitar cable" that grounds "ring" to "sleeve" is acceptable 
> practice for converting the balanced outs on the xl-7 to 
unbalanced.
> 
> --Ezra
> 
> 
> --- In xl7@y..., Alex Strudley <Alexs@e...> wrote:
> > Biggest thing that helps is to use high quality shielded 
cables.  
> Don't use
> > those plasticky orange and grey 6 dollar Hosa cables. Do not run 
> regular
> > instrument cables through your mixer to your sound card.  Get 
the 
> more
> > expensive cables for that.  You can use regular instrument 
cables 
> on your
> > synths to go into the mixer but not on the soundcard and not 
from 
> your
> > studio monitors back to the mixer.  The extra money is worth it.
> > Above all use a power conditioner like a furman Rack Rider.
> > Don't get a Juice Goose because they are simply a power strip in 
a 
> rackmount
> > case but the Furmans have RF filters in them.  A Furman Rack 
Rider 
> is about
> > 50 bucks from AMS or Musician's Friend.  Best 50 bucks you will 
> ever spend.
> > I've got a few of them and can not imagine the horrors I would 
face 
> if I ran
> > all my stuff through regular power strips that you could buy at 
a 
> hardware
> > store.  No ghetto cables and no ghetto power supplies.  Your 
world 
> will be
> > better.
> > 
> > Alex
> > ------------------------------------
> > 
> > 
> > 
> > miki3mikius wrote:
> > 
> > > --- In xl7@y..., erik_magrini@B... wrote:
> > >
> > > thanks for your help! It was a grounding problem. I had the 
cabels
> > > from my computer soundcard next to mp7 in the mixer and that 
> produced
> > > the infamous hum. Still there is a very slight hum (higehr in 
> tune),
> > > but thats tolerable. Btw can anyone tell me how these grounding
> > > problems happen and what to do to avoid them? Still I would 
like 
> to
> > > run both the emu and the computer through my mixer.
> > > Michael
> > >
> > > > Does any of your other gear make a hum when connected to 
those 
> same
> > > leads
> > > > by any chance?   Not saying it's not your XL_7, just make 
sure 
> it's
> > > not  a
> > > > grounding issue first.  If you still have it, maybe pop open 
the
> > > botom and
> > > > make sure everything is screwed in tight?
> > > >
> > > > rEalm
> > > >
> > > >
> > > >
> > > >
> > > > brand new machine with the hum. Not on the headphones but on 
the
> > > main outs
> > > > (not on the subs). Anyone any idear?
> > >
> > >
> > > To unsubscribe from this group, send an email to:
> > > xl7-unsubscribe@y...
> > >
> > >
> > >
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