How should I fix this noise problem?

Farshad · 12th January 2008, 06:24 PM

Hi guys,

I notice when I connect 1/4 cables via XLR adapter to the input of my preamp (SCA N72) there is a noise which is audiable at high gain even if the other end of the cable is not connected to anything. Using a XLR to XLR does NOT produce this noise. I was wondering about the best way of converting a 1/4 siginal to XLR. Should I get a DI box?

Any help is greatly appreciated.

Cheers

mmcfarlane · 12th January 2008, 07:52 PM

Assuming your 1/4 cable and/or adaptor are TS and not TRS:

Does the adaptor short the cold to ground, or does it leave it open...? Somehow it is converting 3 wires into 2.

There are many ways to wire an adaptor. Check the manual of your preamp for what it expects for an unbalanced input and then use their recomendation.

Maybe I should have asked first, what exactly are you connecting to what, with what kind of cable-plug is on each end? Be specific about whether any 1/4 jacks or female sockets are 2-wire TS or 3-wire TRS.

Farshad · 12th January 2008, 08:45 PM

Hi Mark,

Thanks for the reply. I have not looked into the adapter but I am going to. I noticed if I plug he 1/4 cable into he adapter i makes that noise so it probably has to do with the connection as you said.

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12th January 2008, 06:24 PM	#1
Farshad Lives for gear Join Date: Jun 2006 Location: Toronto, Canada Posts: 566	How should I fix this noise problem? Hi guys, I notice when I connect 1/4 cables via XLR adapter to the input of my preamp (SCA N72) there is a noise which is audiable at high gain even if the other end of the cable is not connected to anything. Using a XLR to XLR does NOT produce this noise. I was wondering about the best way of converting a 1/4 siginal to XLR. Should I get a DI box? Any help is greatly appreciated. Cheers __________________ Apogee Rosetta 200, Lexicon PCM91, DSI Evolver, Korg Triton Extreme 61, Alesis Fusion 8HD, Roland JD990, Roland D550, SCA N72s, Audio Technica AT4040, Event True Reference 8

12th January 2008, 07:52 PM	#2
mmcfarlane Gear maniac Join Date: Sep 2007 Location: Middle East Posts: 294	Assuming your 1/4 cable and/or adaptor are TS and not TRS: Does the adaptor short the cold to ground, or does it leave it open...? Somehow it is converting 3 wires into 2. There are many ways to wire an adaptor. Check the manual of your preamp for what it expects for an unbalanced input and then use their recomendation. Maybe I should have asked first, what exactly are you connecting to what, with what kind of cable-plug is on each end? Be specific about whether any 1/4 jacks or female sockets are 2-wire TS or 3-wire TRS. __________________ Mark McFarlane Arkose Records

12th January 2008, 08:45 PM	#3
Farshad Lives for gear Join Date: Jun 2006 Location: Toronto, Canada Posts: 566	Hi Mark, Thanks for the reply. I have not looked into the adapter but I am going to. I noticed if I plug he 1/4 cable into he adapter i makes that noise so it probably has to do with the connection as you said. __________________ Apogee Rosetta 200, Lexicon PCM91, DSI Evolver, Korg Triton Extreme 61, Alesis Fusion 8HD, Roland JD990, Roland D550, SCA N72s, Audio Technica AT4040, Event True Reference 8

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