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Post subject: High frequencies
Posted: Thu Feb 28, 2008 8:26 am
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Hello,

I am not sure if this is the right place to post this, but I have a question about some digitech pedals that I have. I have an Eric Clapton pedal and the Digitech RP 150. Every time I have them on, there is sort of a high sqeal or frequency that comes out of them. Is there anyway to fix this? Another pedal or something that will help take this away.

Thanks!


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Posted: Mon Mar 03, 2008 3:29 pm
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Is it like a feedback squeal? Or kinda noisy/raspy like a distortion? Is it continuous or intermittent?

First thing I'd check are the levels (gain, whatever they're called on each pedal) to eliminate a high gain amplification of low level noise coming from either one, if it's like feedback squeal.

If it's like the second type, it's probably low level digital noise coming from one of them that's being amped by the other. I have an RP200 that is pretty quiet, so it's probably not your RP.

If it's intermittent, do you wear a cell phone on your hip near the back of your guitar and its controls? We had bass player whose phone would bleed noise over into the back of his bass every time it told the towers where it was!

Give me a little more detailed description about the noise and I'll try to help you figure it out.


Last edited by telecaster1987 on Tue Mar 04, 2008 2:50 pm, edited 1 time in total.

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Posted: Mon Mar 03, 2008 3:48 pm
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Try taking one of the pedals completely out of the chain and see what happens. If that one is clean, take it completely out and try the other. If one of them squeals by itself then it's a problem with that pedal. Are you running them off of batteries, individual power supplies, or a common power supply? If it's a common power supply, try using just batteries or individual power supplies. If that doesn't help, try using different cables all around and see if that helps.


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Posted: Mon Mar 03, 2008 8:37 pm
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Yo! This post doesn't belong in the Stratocaster section! Try the Fender Lounge...


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Post subject:
Posted: Tue Mar 04, 2008 7:40 am
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Sorry if I posted in the wrong section, I wasn't sure where it belonged. It's continuous when the pedal is on, when the pedal is off there is no noise. I don't know how to describe it other than it's a high noise. Not like distortion or a squeal. It's not that bad, but it's noticable. I didn't know if there was a pedal that would help with it.


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Posted: Tue Mar 04, 2008 2:49 pm
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Sounds to me like it's a bit of digital noise. I looked at the Clapton pedal and it appears to be a an amp modeling pedal like the RP. You might be able to filter it out with EQ on your amp or PA, of course it'll alter your tone, too.

BTW, I've noticed a lot of posts lately regarding hum and hiss and other types of noise, and one thing I can tell you all, as an electronics tech, there are a lot of dead quiet amps and stuff out there, but we exist in electrically noisy environments (especially indoors) and sometimes we can't achieve super quiet conditions no matter what we try. Most Fender amps (I own two) have some sort of inherent noise, especially when we crank them up.

I've heard CB radios over PA systems, cell phone noise bursts through a Warwick built in bass preamp, switching noise from my laptop's AC power supply when plugged into the POD XT Live hooked to my amp, light dimmer, and fluorescent light noise, and 60 cycle AC hum from guitar cords with bad grounds. All that said, sometimes we just have to bite the bullet and deal with it. It's irritating, annoying, and we try to eliminate noise when we can, but it's part of the price we pay as folks who play amplified instruments.

Try a graphic EQ pedal, hopefully you can notch out the noise.

Good Luck!


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Posted: Tue Mar 04, 2008 2:57 pm
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I use an EC pedal and never have a high pitch squeal. If you've taken everything out of your chain, tried a new cable and it's still making that noise I'd say there something wrong with it. If it's new, return it.

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Posted: Tue Mar 04, 2008 6:15 pm
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If you are using a modeling amp, they often create a high pitched whine. Perhaps you just need to re-examine your gain staging... something in the chain turned up too high.


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Posted: Tue Mar 04, 2008 7:22 pm
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Cryingstrat and stratholic are right.

Bottom line, separately hook up each pedal to your amp, and crank the gain to figure out which one it is, WITHOUT anything plugged into them. Cryingstrat says his EC pedal is quiet, my RP is quiet, so one or the other might be defective as he said.

Then hook them up together to the amp, if the noise comes back, check the gains. Remember that gain stages amplify everything, including noise.


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Posted: Wed Mar 05, 2008 8:20 am
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Could it just be my house? I haven't taken it anywhere out of the house yet to try it. I wonder if it's in our electrical wiring at the house. I'll try all the suggestions and let you know.

thanks!


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Posted: Wed Mar 05, 2008 2:14 pm
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It's possible. Remember my post about noisy environments. A nearby computer might cause a high pitch noise on the house wiring, or it might be due to proximity. Dimmers and fluorescent lighting tend to make a buzzing lower frequency noise nearer a 60 Hz hum. Outside noise usually comes in through the input cable or power supply connections.

Also, try plugging in the gear like I said before with a guitar plugged into it with the volume turned all the way down, which grounds the input, preventing any stray noise from being amped. That way you can determine if the front end of the offending pedal may be picking up noise. It'll show up, if at all when you try the other suggestion where nothing is plugged in. Try different rooms, another locale, like you said, too.

Good luck!


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Posted: Wed Mar 05, 2008 2:28 pm
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It could also be your guitar cable. If some ran over it with something heavy like an amp caster etc, it could be damaged and causing hum and/or noise.


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Posted: Wed Mar 05, 2008 6:39 pm
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Strataholic wrote:
It could also be your guitar cable. If some ran over it with something heavy like an amp caster etc, it could be damaged and causing hum and/or noise.


That's also a possibility. All coaxial cables have a capacitance per foot as well as an impedance. A flattened cable could have it's capacitance altered.


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Posted: Fri Mar 07, 2008 9:43 am
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Well, I don't do much gigging but I do play at Church. I changed the guitar cables and that seemed to help. I still have a little bit but not as much as there was. I wonder if it is just the wiring in my house.

Thanks guys!!


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