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FDP Forum / Home Recording Forum / PC Noise in Reording Interface

69tele

Gibraltar

Thou Shalt Gas !
Feb 25th, 2015 02:22 AM   Edit   Profile   Print Topic   Search Topic

Hi guys looking for a bit of help.

Got a new USB recording interface and I am hearing the computers hard disk and general interference type noise in the mix.

After some testing I noticed that if unplug the USB connection from my main sound module this goes away.

I am thinking this is a ground loop issue as both the interface and module and connected by USB to the PC and then the module comes back in by audio ?

All the units are connected to the same power strip and this has been check for polarity and ground with a socket tester.

Other than running the module from another PC any ideas ?

My previous interface (same brand less channels) didnt have this issue

my setup

(This message was last edited by 69tele at 04:23 AM, Feb 25th, 2015)

Dadical
Contributing Member
**********
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I am not a complete

idiot - I have several pieces missing!
Feb 25th, 2015 04:09 AM   Edit   Profile   Print Topic   Search Topic

Why isn't the module just connected to the synth?

reverendrob
FDP Data Goon
Moderator

When I sin

I sin real good
Feb 25th, 2015 09:03 AM   Edit   Profile   Print Topic   Search Topic

Is this noise *actually* on the recording, or is it on the playback only?

69tele

Gibraltar

Thou Shalt Gas !
Feb 25th, 2015 09:08 AM   Edit   Profile   Print Topic   Search Topic

the module is for multitrack midi plaback, the synth is mainly for preparing tracks (controller keyb) and also has its own sounds and a vocoder.

noise is on recording as well as playback

gdw3

LA-la-land, CA

Insert clever comment here
Feb 25th, 2015 12:07 PM   Edit   Profile   Print Topic   Search Topic

Since the noise goes away when you unplug the module, my guess is RF interference coming from the module itself. Try longer cables, or moving it around, and see if that makes any difference. Did you try a different USB cable? Could be that simple. Does it happen when the module is powered off as well? If not, then probably not a ground loop. I've never heard of a ground loop being a problem in this kind of setup, when all components are working correctly. What about if you hook the keyboard directly into the module, and play it through an amp? Is there noise then?

Dadical
Contributing Member
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I am not a complete

idiot - I have several pieces missing!
Feb 25th, 2015 07:20 PM   Edit   Profile   Print Topic   Search Topic

Some components have a ground lift switch for just this type of issue. Have you checked that?

69tele

Gibraltar

Thou Shalt Gas !
Feb 26th, 2015 01:40 AM   Edit   Profile   Print Topic   Search Topic

thanks for the replies, did some further testing both the synth and the module have same issue

in also happens when the power is off.

I also tried running the module from a laptop and the noise was also there.

possibly have a dirty earth at home ?

I was thinking what Dadical said getting a DI box and using the ground lift.

Achase4u

U.S. - Virginia

Feb 26th, 2015 09:37 AM   Edit   Profile   Print Topic   Search Topic

I have an ebtech hum-x on some of my equipment. Even all on the same outlet in the room, I get noise. So some tweaking is necessary. They have in-line usb isolators and such, but I haven't had much luck with those.

I like the hum-x though.

gdw3

LA-la-land, CA

Insert clever comment here
Feb 26th, 2015 12:11 PM   Edit   Profile   Print Topic   Search Topic

Bummer. If it's present with the power off, then yeah, I might lean toward a grounding issue. Maybe the ground lift idea will help, but if it's happening with more than one component, I suspect your power itself. I have similar problems with dirty power at home with my amps and pedals. Fortunately, it doesn't seem to effect my recording set-up as much.

(This message was last edited by gdw3 at 02:38 PM, Feb 26th, 2015)

69tele

Gibraltar

Thou Shalt Gas !
Feb 27th, 2015 01:56 PM   Edit   Profile   Print Topic   Search Topic

thanks for all the replies much appreciated

will investigate the hum-x

also might something like a furman power conditioner help ?

69tele

Gibraltar

Thou Shalt Gas !
Feb 27th, 2015 01:58 PM   Edit   Profile   Print Topic   Search Topic

is this the ebtech device ?

Link

Achase4u

U.S. - Virginia

Feb 27th, 2015 02:37 PM   Edit   Profile   Print Topic   Search Topic

Ebtech hum-x here

For in line power.

Once you get into power conditioning, it's allot of electrical lingu I don't understand.

http://www.bhphotovideo.com/c/buy/Hum-Eliminators/ci/15139/N/3992462126

Roly
Contributing Member
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Whitehorse Canada

I don't get out much
Feb 27th, 2015 05:50 PM   Edit   Profile   Print Topic   Search Topic

Does it happen with the audio cables disconnected?
Are the audio cables balanced?

69tele

Gibraltar

Thou Shalt Gas !
Mar 1st, 2015 05:27 AM   Edit   Profile   Print Topic   Search Topic

it happens without power and I have tried balanced and unbalanced cables coming out from the Interface to the monitors.

Bit of progress though .. part of the noise (which was constant) was crackling and popping and it was down to a laptop power supply plugged into the same outlet, it was even affecting my amp ! much better now but still have the ground loop issue.

Going to try a DI box today with a ground lift



69tele

Gibraltar

Thou Shalt Gas !
Mar 1st, 2015 07:11 AM   Edit   Profile   Print Topic   Search Topic

DI box with ground lift solves the issue.

More gizmos to connect in the loop but seems to sort it out !

Dadical
Contributing Member
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I am not a complete

idiot - I have several pieces missing!
Mar 1st, 2015 10:58 AM   Edit   Profile   Print Topic   Search Topic

Those pesky electrons are always jumping around and making noise. Glad you got 'em under control.

69tele

Gibraltar

Thou Shalt Gas !
Mar 1st, 2015 12:36 PM   Edit   Profile   Print Topic   Search Topic

Thanks Dadical .. it wasn't easy ! having a proper studio built soon, first thing I told the builder was to make sure I had a clean electrical supply !!!

FDP Forum / Home Recording Forum / PC Noise in Reording Interface




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