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ZULEIKA DECIGA
Talent and/or Voice Producer - Voice Seeker
Joined: 11 Feb 2004
Posts: 12
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 Posted: Tue Nov 06, 2007, 00:57 (GMT) Post subject: Noise problem... |
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Hello guys!
I have a question here. I have a noise in the background. Could you help me find out how I can fix this problem?
I do have a DBX 286 A Mic Processor and a Mic MXL V69 a Mia audio card and upgraded 2007 computer.
Please check the audio so you can have an idea.
Any info you can give me would be awesome!
Thanks,
Zuleika
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Jacob Ekstroem
Talent and/or Voice Producer
Joined: 23 Jul 2007
Posts: 721
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| Posted: Tue Nov 06, 2007, 01:27 (GMT) Post subject: |
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Ouch, that's noise alright. Has it always been like this, or did the noise appear suddenly overnight?
It could be numerous things; bad connections, faulty tube or faulty mic, but for starters, bypass everything on the dbx:
- make SURE the 48v phantom power is OFF!!! (no yellow LED)
- bypass the Highpass-filer (no green LED)
- bypass the processing (yes, red LED has to glow!)
- just to make sure, turn both knobs in the "compressor"-section down to "off"
- bypass the de-esser (turn threshold-knob down to "off")
- bypass the enhancer (both knobs down to "off")
- bypass the expander (again, threshold-knob down to "off")
Now, the dbx is just a preamp. Adjust the gain-input, so your normal read into the microphone makes the yellow LED flash occasionally. Then, adjust the output, so the red LED flash on plosives (loud "p"sounds for example), and then turn it down a notch, just so the LED no longer flashes.
Still noisy?
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Regards,
Jacob Ekstroem
- "Try the delightful Danish..."
SaVoa  No. 07008 |
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Scott Greenia
Talent and/or Voice Producer
Joined: 24 Sep 2007
Posts: 200
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| Posted: Tue Nov 06, 2007, 02:46 (GMT) Post subject: |
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Have you tried replacing the mic cable?
I just bought a Mogami's 110 Ohm W3080 cable with Neutrik XLR connectors (NC3MX-B, NC3FX-B) off ebay.
It sure made a difference from what I was using !
Also, there a loud pop right before you say cinco in the second spot. Something else to check out...where that came from.
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Scott Greenia |
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Ed Gambill
Talent and/or Voice Producer
Joined: 04 Jun 2007
Posts: 585
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| Posted: Tue Nov 06, 2007, 02:51 (GMT) Post subject: |
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Circuit noise.
I uses to get it big time when I used my FP32 (Shure portable mixer used in film and video production sound recording) Then I did what Shure advised, (1) use the mic pre to get sufficient gain and then (2) not bringing up the master so much as to induce circuit noise.
It sounds like too much gain in one of the stages for sure.
Jacob scores another TD (Technical Dissertation)
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Esse quam videri "To be rather than to seem"
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Jacob Ekstroem
Talent and/or Voice Producer
Joined: 23 Jul 2007
Posts: 721
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| Posted: Tue Nov 06, 2007, 03:02 (GMT) Post subject: |
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| Scott Greenia wrote: | | Also, there a loud pop right before you say cinco in the second spot. Something else to check out...where that came from. |
hmmm, good thing you listened that far, Scott - I didn't, and therefore didn't catch that click  There's one at 1:15 aswell. That's bad.
Zuleika, this could turn out a bit tricky (and geeky, not to mention!) but let's give it a shot. If either the bypass-trick or replacing cables don't solve the noise, we'll try something else. Regardless, those clicks need attention, but it's 3.00 am where I'm at, so I have to pull out for now, but I hope maybe when I wake up and check the thread in the morning, everything is dandy! 
EDIT: Aaah, I see the cavalry has already responded our call!!! (thanks, Ed. But I'm not resting on this, until I hear a clean & crisp recording!)
_________________
Regards,
Jacob Ekstroem
- "Try the delightful Danish..."
SaVoa No. 07008 |
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ZULEIKA DECIGA
Talent and/or Voice Producer - Voice Seeker
Joined: 11 Feb 2004
Posts: 12
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| Posted: Wed Nov 07, 2007, 00:46 (GMT) Post subject: Noise problem |
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First of all, THANKS Jacob, Scott and Ed for taking the time to help me figuring out this problem.
I have this problem FOREVER. I brought 3 different audio engineers to help me out and the noise is still there. I changed cables, microphones, audio card, and even my computer.
I forgot to mention that I have a mixer that is conected to the mic processor. This is an Eurorack UB502. I'm sure this changes completely the picture.
I followed each of the steps Jacob mentioned and the noise is still there. Boomer!
The only thing I haven't try is playing with the electrical cables behind my pc. Do you think this is the problem? There is an electrical outlet close to the mic procesor. Do you guys think I should move the mic procesor to other location?
Again thanks so much for your help on this!
Zuleika
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Emmett Andrews
Talent and/or Voice Producer
Joined: 17 Jul 2004
Posts: 132
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| Posted: Wed Nov 07, 2007, 01:23 (GMT) Post subject: |
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Couple things I notice...
1) Is your processor running through a splitter and into a stereo channel in the mixer? I'm not saying that would cause the noise, but it wouldn't help any. That is a mono processor and can just be run directly into a mono channel. By splitting it, you're not only dividing the power, but also changing the impedance and unbalancing the signal. I doubt it's the source of the noise, however.
2) I'm leaning toward the Behringer. Those teeny Behringer boards often sound funny (IMO). I'm not sure what it is, but something about them never sounds right to me. Why don't you take the Behringer out of the path? Run the processor directly into the soundcard and see what happens!
Emmett
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Emmett Andrews
Talent and/or Voice Producer
Joined: 17 Jul 2004
Posts: 132
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| Posted: Wed Nov 07, 2007, 01:24 (GMT) Post subject: |
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| P.S. I also notice that the gain on the Behringer input is CRANKED.
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Jacob Ekstroem
Talent and/or Voice Producer
Joined: 23 Jul 2007
Posts: 721
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| Posted: Wed Nov 07, 2007, 01:59 (GMT) Post subject: |
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| Emmett Andrews wrote: | | Why don't you take the Behringer out of the path? Run the processor directly into the soundcard and see what happens! |
Learning about the use of a mixer, that would've been my next suggestion too. The cabling with the splitted TRS-inputs to the mixer looks weird. At least, you should try and go from the dbx to the mono (line in) channel on the Behringer with a balanced cable. That would be a cable with a 1/4" TRS-jack in both ends looking like this:
(Notice the two black rings on the plug just before the tip.)
The electrical outlet close to the dbx shouldn't be able to cause problems in this scale. But as electrical sources can introduce hum, it won't hurt to move the dbx away from it anyway.
I think Emmett is right regarding the Behringer NOT being the primary cause of noise. Sure, the really - REALLY! - low budget Behringer's are a bit noisy, but I actually have an old MX602A, which I believe is quite similar in construction as the UB502, and when worked correctly, it's not THAT noisy. But cranking the gain the way you have on yours WILL amplify noise.
However... you mention, you have replaced anything BESIDES the Behringer. Hmmmm...! This is why it would be interesting to completely take the mixer out of the chain.
Now, if the above suggestions doesn't do any good either, we have to look into your soundcard. I hate to think the MXL V69 is the problem, and besides replacing the tube in it (which is probably fine), there's not much to change here anyway.
_________________
Regards,
Jacob Ekstroem
- "Try the delightful Danish..."
SaVoa No. 07008 |
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ZULEIKA DECIGA
Talent and/or Voice Producer - Voice Seeker
Joined: 11 Feb 2004
Posts: 12
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| Posted: Wed Nov 07, 2007, 08:02 (GMT) Post subject: Thanks guys! |
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Thanks Emmett. I'll try to take the mixer out of the equation. I'll let you guys know after this changes...
Zuleika
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ZULEIKA DECIGA
Talent and/or Voice Producer - Voice Seeker
Joined: 11 Feb 2004
Posts: 12
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| Posted: Wed Nov 07, 2007, 08:12 (GMT) Post subject: |
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I checked the gain on the mixer and is not cranked -is in minimum- Before I got the mic MXL V69 I had the same issue. However, the V69 is noisier than the previous one.
I'll remove the mixer and check with another mic...
I'll keep you guys posted!
Cheers,
Zuleika
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Jacob Ekstroem
Talent and/or Voice Producer
Joined: 23 Jul 2007
Posts: 721
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| Posted: Wed Nov 07, 2007, 12:49 (GMT) Post subject: |
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| ZULEIKA DECIGA wrote: | | I checked the gain on the mixer and is not cranked -is in minimum |
Zuleika,
Now I'm a little confused. Refering to the posted picture of your mixer, you don't have anything connected to channel 1, which is the input you say is in minimum?? Did you for any reason remove the cable from the dbx before taking the picture?
Also, I still can't figure out the cabling you have in channel 2/3 and 4/5, so do us a favour and explain, how you have your mixer set up. You can use the picture below as a reference.
It should be connected something like this:
- Output from dbx in green input;
- Any stereo inputs you may use in blue inputs;
- Output from mixer to soundcard in red outputs;
- Output from soundcard back to the mixer in yellow "Tape In" inputs. (Remember: "Tape to mix" has to be "off", i.e. the switch up.)
But tell us how you have it set up now, and we'll take it from there.
_________________
Regards,
Jacob Ekstroem
- "Try the delightful Danish..."
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ZULEIKA DECIGA
Talent and/or Voice Producer - Voice Seeker
Joined: 11 Feb 2004
Posts: 12
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| Posted: Mon Nov 12, 2007, 09:13 (GMT) Post subject: Noise problem... |
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Hello guys!
Answering Jacob's questions:
Now I'm a little confused. Refering to the posted picture of your mixer, you don't have anything connected to channel 1, which is the input you say is in minimum??
Yes I was talking about that one.
Did you for any reason remove the cable from the dbx before taking the picture?
Nope.
Also, I still can't figure out the cabling you have in channel 2/3 and 4/5, so do us a favour and explain.
I don't know either!!!! I'm not being very helpful here. However, I can take more pics from the back of my computer and the cables. That might help?
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| These are the only 2 cables conected to the Dbx (the mic input and the output) |
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Emmanuel Soussan
Talent and/or Voice Producer - Voice Seeker
Joined: 14 Feb 2004
Posts: 94
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| Posted: Mon Nov 12, 2007, 10:18 (GMT) Post subject: |
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Seen ur setup , u can't plug the DBX 286 A directly in the sound card !
But try to plug the Outputs of the DBX in the SAME channel in the Mixer , see the pic below !
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RADIO IMAGING AND SOUND DESIGN
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Jacob Ekstroem
Talent and/or Voice Producer
Joined: 23 Jul 2007
Posts: 721
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