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

I understand being packed for room but a power conditioner only occupies 1
rack space and is only about 4 inches deep.  I have a rack that I use for
giging and studio applications.  I take this rack with me wherever I go.  10
Spaces big and everyone I know who has a rack no matter how big or small,
has a power conditioner module in the top space.  It's just like a rule.  If
you are going to buy a 10 space rack, think of it as 9 because automatically
designate one space for power.  If your rack can't hold any more gear, time
to get a new rack.  Power conditioners are essential.

mikexl7 wrote:

> 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?
> > > >
> > > >
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> > > >
> > > >
> > > >
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