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liddlebidago
Posts: 8
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 Posted - Thu Jul 31, 2003 6:29 am |
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I know this is similiar to the radio problem in a previous thread, but maybe the solution is different. Here's my problem. I'm recording electric guitar with a mic that goes into a preamp and then into my breakout box. When I listen to my monitors through headphones and touch my guitar, the monitor mix comes out of my speaker in my guitar amp. If I let go of my guitar, it's gone. I'm pretty sure it's my guitar, but I don't know what to do about it.
Thanks, and again I apologize about the redundancy.
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SteveG
Location: United Kingdom
Posts: 6695
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| Posted - Thu Jul 31, 2003 7:55 am |
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Without actually witnessing the effect, this is a bit of a guess, but...
This sounds far more like some sort of electromagnetic or capacitive coupling effect than anything to do with RFI. You will find that if you hold the earphones near enough to the pickup coils on your guitar, you'll probably hear the monitor mix anway, regardless of what you're touching! Basically, you'll have built yourself an open-air transformer - the coils in the headphone being the primary and the pickup coil being the secondary. But it's also possible for some signal to get transferred to your body, and capacitive coupling to take place - and if you are using a highly amplified setting, the pickup area is very sensitive to anything like this near it at all.
Humbucker pickups tend to suffer less from this because of the cancellation effects theyuse, and some guitars are rather better screened than others, and are less likely to do this anyway. Probably the best remedy will lie in and around the guitar, though - this is the most likely area to be screwed up by inconsiderate manufacture, after all.
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liddlebidago
Posts: 8
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| Posted - Thu Jul 31, 2003 10:28 am |
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| SteveG wrote: | Basically, you'll have built yourself an open-air transformer - the coils in the headphone being the primary and the pickup coil being the secondary. But it's also possible for some signal to get transferred to your body, and capacitive coupling to take place - and if you are using a highly amplified setting, the pickup area is very sensitive to anything like this near it at all.
Humbucker pickups tend to suffer less from this because of the cancellation effects theyuse, and some guitars are rather better screened than others, and are less likely to do this anyway. Probably the best remedy will lie in and around the guitar, though - this is the most likely area to be screwed up by inconsiderate manufacture, after all. |
So pretty much my solution if i want to continue using my single coils is to turn down the amp and the headphones?
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SteveG
Location: United Kingdom
Posts: 6695
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| Posted - Thu Jul 31, 2003 4:35 pm |
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| liddlebidago wrote: | | So pretty much my solution if i want to continue using my single coils is to turn down the amp and the headphones? |
It would help to narrow this down a bit if you try a few experiments. Initially try turning down the headphones and make sure that it really is this feed that's causing this. Also, try moving them around to see if the effect does vary. And it may well be worth checking out the guitar wiring - this really isn't very good a lot of the time. I've seen quite a few guitars where the screening between the pickups and the volume control area was dependant on tin foil glued to the wood, rather than screened lead, and whilst this will work fine a lot of the time, you do have to take a lot of care with it.
The other thing to try, obviously, is another guitar to see if the effect changes - this will give you a pretty big clue about the real culprit!
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motorhead6
Posts: 193
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| Posted - Fri Aug 01, 2003 4:17 am |
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It has something to do with the electricity.
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Monitor signal in guitar amp