Background static won't go

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pepineros
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Background static won't go

Post by pepineros » Wed Aug 13, 2008 9:23 am

Hi everybody,

I've been using Audacity for about a year now, usually pretty happy with the results I got when recording voice, guitar or whistle. There was always quite some background static but I thought there wasn't really something I could do to remedy that. However, some time ago a friend of mine recorded some voice of her own (also using Audacity) and there was almost no background static on that recording. I asked her how she did it; she used a standard (quite cheap) dynamic mic plugged directly into the mic-in of her pc. When I record, I use a Stagg MCO-7W condenser mic (see http://www.lagom.nl/misc/stagg-mco7.html for specs); I do believe it's better quality and also better for recording (as it's a condenser mic), so that won't be the problem. (If it's relevant, the Stagg runs on a Behringer mic pre-amp for fantom power.)
I recently tried to plug my keyboard directly into the line-in of my pc, expecting not very good quality but at least less background static; and there was just as much (maybe even more) as when recording with microphones. Because of that I don't believe the mic is the problem. I have windows Vista, but I had the same problem on my previous pc which ran on xp. The sound card is managed by a Realtek High Definition Audio driver (with all options like noise reduction and such turned off, for obvious reasons). The lines run as follows: from the mic to the input of the preamp, then from the output of the preamp to the mic-in of my pc. (I tried using the line-in but I couldn't even hear myself.)
So, my question is: how do I reduce background static without Audacity's noise reduction function ('cos that gives me the already-mentioned-on-this-forum R2-D2 romping through my recording)? I'm sorry for the long story, thanks in advance for helping me out :)
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Re: Background static won't go

Post by steve » Wed Aug 13, 2008 6:11 pm

It is MUCH better to fix the source of the noise than try to correct it in post production.

I suspect that your sound card is the problem, but it would be good to eliminate the possibility of the microphone / pre amp combination first. Do you have any way of testing it? could you for example do a test recording with it on some other equipment?
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Re: Background static won't go

Post by kozikowski » Wed Aug 13, 2008 11:16 pm

<<<(I tried using the line-in but I couldn't even hear myself.)>>>

So right away you're in trouble. The job of the microphone amplifier is to boost the tiny sound level sound coming out of the microphone to the much higher line level so it will fit in the Line-In of your sound card. That is precisely how I do very high quality recordings

Do you have an iPod, portable CD player, or much older WalkMan tape player? How about a nice male to male 1/8" stereo cable? Hook that combination up to the Line-In of your sound card (Headphone Out to Line-In) and leave the music player turned off.

Dig around in the Windows Sound Control panels and turn everything off but the Record -- Line-In.

Launch a fresh Audacity and click once inside the red record meters. You are now measuring the noise level of the sound card. The bouncing meters, if they appear at all should be in the -60 range. I suspect yours are going to be very much higher than that and there is nothing for it but to change the sound card. It will never get any better than that.

Let us know.

Koz

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Re: Background static won't go

Post by kozikowski » Wed Aug 13, 2008 11:17 pm

<<<(If it's relevant, the Stagg runs on a Behringer mic pre-amp for fantom power.)>>>

It could be very important. Which Behringer?

Koz

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Re: Background static won't go

Post by steve » Wed Aug 13, 2008 11:45 pm

kozikowski wrote:Dig around in the Windows Sound Control panels and turn everything off but the Record -- Line-In.
Very important that. With only "Line in" selected, I get a noise floor of around -80dB on my very old Sound Blaster Live sound card, but if I leave other inputs active the noise floor can go right up to -40dB.
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Re: Background static won't go

Post by pepineros » Thu Aug 14, 2008 12:42 pm

stevethefiddle wrote:I suspect that your sound card is the problem, but it would be good to eliminate the possibility of the microphone / pre amp combination first. Do you have any way of testing it? could you for example do a test recording with it on some other equipment?
I used this combination on three different computers now, with no difference in background static. I used the mic without preamp as well (plugged into the mic-in) but that was even worse. I have at least ruled out the option of a bad preamp, and I still think it's safe to say the mic is not the problem.
kozikowski wrote:Do you have an iPod, portable CD player, or much older WalkMan tape player? How about a nice male to male 1/8" stereo cable? Hook that combination up to the Line-In of your sound card (Headphone Out to Line-In) and leave the music player turned off.
I only have male to male 1/4" cables, but I'll get 1/8" tips for that. I'll let you know how it went as soon as I tested.
kozikowski wrote:It could be very important. Which Behringer?
It's the Tube Ultragain mic100, which I just noticed, had the Limiter switch turned on. I tried some recording with that switch turned off and it sounded lots and lots clearer. I don't really understand why (limiters usually don't have that much effect on recording quality, and also, I used to have a lot of background static whether the limiter was on or not) but it's good of course.

I'll get some 1/4 to 1/8" tips today and try your method Koz. Lots of thanks to you and steve for all the help, I'll let you know as soon as I tested :)
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Re: Background static won't go

Post by steve » Thu Aug 14, 2008 2:33 pm

pepineros wrote:and I still think it's safe to say the mic is not the problem.
Why do you think "it's safe to say"? Have you tested it? Even expensive microphones can be faulty (I once bought a $250 condenser microphone that was noisy and had to get it replaced under warranty, and I notice in the review that you linked to "I had to get it exchanged in the store twice shortly after I bought it because something broke in the electronics.").
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pepineros
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Re: Background static won't go

Post by pepineros » Sun Aug 17, 2008 11:18 am

my dad used it before me and emphasized the low leven of background noise when he gave it to me, said he had never experienced the amount of noise I'm getting. He also recorded on harddrive, like I do. Still of course, the mic is quite old by now, six years at least. Maybe that's part of the problem.

I haven't been to town since last post so I still haven't got the 1/8" plugs for the cable I was going to get. I'll post back when I tested.
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Re: Background static won't go

Post by shn70 » Fri Aug 29, 2008 12:31 am

Have you checked the background static level without using the wall socket for power? If you have battery power try that, it could be the grounding on your power supply which is giving you the static.

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Re: Background static won't go

Post by kozikowski » Fri Aug 29, 2008 4:56 am

<<<Still of course, the mic is quite old by now, six years at least. Maybe that's part of the problem.>>>

Or maybe not. The Left-Right sound test from here was recorded with an RCA BK-5b microphone. A sixty-year old BK-5b.

http://www.kozco.com/tech/soundtests.html

Koz

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