It is currently Mon Jun 26, 2017 3:36 am
   
Text Size

EMI shielding Computer

Here's where to talk about preamps, cables, microphones, monitors, etc.

Moderator: James Steele

Forum rules
Here's where to talk about preamps, cables, microphones, monitors, etc.

EMI shielding Computer

Postby Majshumlan » Wed Jan 11, 2017 11:26 pm

Hi

I have a smaller homestudio where I mainly record guitars.I have a bad interference from my computer sitting inside a desk and the room is pretty small so its hard to get away.
Have any of you shielded your computer with success?

Thanx
Majshumlan
 
Posts: 7
Joined: Mon Sep 01, 2014 10:32 pm
Primary DAW OS: Windows

EMI shielding Computer

Postby buzzsmith » Thu Jan 12, 2017 7:44 am

Just to verify...

When you power down your computer (and display), the hum or noise remains?

Buzzy


Sent from my iPad using Tapatalk
Early 2009 Mac Pro 4,1>5,1 3.33 GHz Hex Core Intel Xeon OS X 10.8.5 SSD (32 gigs RAM)
DP 9.01 PCI-424e / original 2408, 2408mkII, 24I/O, MTP-AV

Yamaha C7 Conservatory Grand
Hammond B-3 / Leslie 145
Focal Twin6 Be(s)

User avatar
buzzsmith
 
Posts: 2942
Joined: Mon Dec 27, 2004 11:01 pm
Location: Houston
Primary DAW OS: MacOS

Re: EMI shielding Computer

Postby mikehalloran » Thu Jan 12, 2017 8:39 am

Yes, please describe the problem, not what you think might be the solution.

What computer? Is this a noise problem? If so, what kind of noise (high, low, steady, pulsating etc.) and where is coming from?

As Buzzy asks, does it go away when you turn off your computer?

Is it the computer itself?

I have a great deal of recent experience with some of these issues. Not all the money was well spent, unfortunately.
July 2010 iMac 2.93G i7 Quad, OWC eSATA mod, 32G RAM, OS 10.12.4
828mkII FW; MOTU MTP/AV USB with Firmware 2.0.1; DP 9.13, 9.02, 8.07 64bit, DP 7.24; IK-NI-Izotope-PSP-Garritan Antares, 32Lives, JBridge, MachFive 3.2.1
LogicPro X 10.3, Finale 25.3, 2014.5, Encore 5.0.7, Notion 6, Overture 5, TwistedWave, DSP-Q 4.4, QuickTime Pro 7.6.6, SmartScore Pro X2 10.5.5, Toast 15
Test machine: G4-1K Dual Processor: OS 10.4.11 / OS 9.2.2; DP 5.13; Encore 5.05 & 4.5.5; Toast 9.07b, legacy apps
User avatar
mikehalloran
 
Posts: 8278
Joined: Sun Jan 25, 2009 6:08 pm
Location: Sillie Con Valley
Primary DAW OS: MacOS

Re: EMI shielding Computer

Postby bayswater » Thu Jan 12, 2017 9:30 am

I haven't found a simple way to eliminate this noise from guitars, particularly old Fenders. But simply moving around the room, staying a few feet away from the computer, and orienting the guitar in various positions with respect to the computer monitor usually finds a sweet spot where the noise is not noticeable. You'll want a remote device to control DPs transport so you don't need to be near the computer to record.

Lining the cavity in the guitar with the electronics with copper foil might help in some cases.
iMac 27" i7 16G, DP 8.07/9.02 & OS 10.12.3, Logic 10.3.1, Scarlett 18i8
MBP 16G DP 9.12 & OS 10.12.3, Lexicon Alpha
Dual 2.0G G5 PCI 2G, DP 7.24 & OS 10.5.8, 2408 MKII, UAD-1
User avatar
bayswater
 
Posts: 7904
Joined: Fri Feb 16, 2007 10:06 pm
Location: Vancouver
Primary DAW OS: MacOS

Re: EMI shielding Computer

Postby buzzsmith » Thu Jan 12, 2017 9:42 am

In my situation, I deal with this all of the time when a guitarist comes over. Especially amped and mic'ed and through a lot of pedal effects.

He has to turn to find that "null spot" where the noise is minimal.

I had our local electric energy company come by and do some EMF tests and they showed minimal measurements.

I suspect a very nearby transformer but they doubted that.

Possibly some cabling in or under the house.

Years ago, I turned off all of the power to the house and had my son bring his guitar and battery powered amp down. Still had noise!

Buzzy


Sent from my iPad using Tapatalk
Early 2009 Mac Pro 4,1>5,1 3.33 GHz Hex Core Intel Xeon OS X 10.8.5 SSD (32 gigs RAM)
DP 9.01 PCI-424e / original 2408, 2408mkII, 24I/O, MTP-AV

Yamaha C7 Conservatory Grand
Hammond B-3 / Leslie 145
Focal Twin6 Be(s)

User avatar
buzzsmith
 
Posts: 2942
Joined: Mon Dec 27, 2004 11:01 pm
Location: Houston
Primary DAW OS: MacOS

Re: EMI shielding Computer

Postby jazzylee77 » Thu Jan 12, 2017 1:25 pm

I have a faint buzz that became more of a squeal when I switched to SSD. It is definitely related to the computer doing work. I believe it has to do with my USB interface. I've heard that using a USB isolator may fix the issue. (A little box with optical interface and short usb cable coming out)

I'm using a little Steinberg UR22, and others have had this issue.

Since it is so faint, I've gotten used to it, it does not show up in the final results, I haven't rushed out to buy a USB isolator and see if it works. I think they run $30-$40 bucks online.
DP8 - Windows 10 - i7 4ghz - 32 GB RAM - All Internal SSD harmonica with only one broken reed, lava lamp, cordless drill
jazzylee77
 
Posts: 37
Joined: Sun Jun 23, 2013 4:11 pm
Primary DAW OS: Windows

Re: EMI shielding Computer

Postby Majshumlan » Mon Jan 16, 2017 11:42 pm

Hi


I took some time tryin to figure out the problem.

It gives a hum around 500-2000hz
Before when I turned the computer off it when away.Not this time though.Thats strange
It seems to come from the floor UNDER the computer.I have my room on the second floor and must be some electricals going in the floor to the room under.
I pinpointed the area with my guitar...about a 1x1meter.
I will flick some switches and some fuses downstairs and try to find the the source


thanx
Majshumlan
 
Posts: 7
Joined: Mon Sep 01, 2014 10:32 pm
Primary DAW OS: Windows

Re: EMI shielding Computer

Postby bayswater » Tue Jan 17, 2017 8:05 am

Majshumlan wrote:It gives a hum around 500-2000hz

You mean 50 - 200? 2000hz is not a "hum".
iMac 27" i7 16G, DP 8.07/9.02 & OS 10.12.3, Logic 10.3.1, Scarlett 18i8
MBP 16G DP 9.12 & OS 10.12.3, Lexicon Alpha
Dual 2.0G G5 PCI 2G, DP 7.24 & OS 10.5.8, 2408 MKII, UAD-1
User avatar
bayswater
 
Posts: 7904
Joined: Fri Feb 16, 2007 10:06 pm
Location: Vancouver
Primary DAW OS: MacOS


Return to General Recording

Who is online

Users browsing this forum: No registered users and 2 guests


Who is online

In total there are 2 users online :: 0 registered, 0 hidden and 2 guests (based on users active over the past 5 minutes)
Most users ever online was 151 on Tue Jan 28, 2014 1:07 pm

Users browsing this forum: No registered users and 2 guests

Login Form