so, when you plug your guitar into the PODs input, the snslog signal is converted to digital. at the analog outputs, it's converted from digital back to analog.
each A to D, or D to A conversion can introduce a little noise, so having the FX loop in use adds more. so even if there's a very small ammount of extra noise, if the loop is before an amp model, then it'll boost that noise up.
if you desperately need the loop, try putting a noise gate after it, so that when you're not playing it quietens it
just a thought, are you turning on the loop with nothing connected to it, and that's noisey? what about if you put in a straight cable into the loop? also are you running with the inputs set to guitar and somehting else (like variax) as having guitar and same, may boost the input too much and cause more extra unwanted noise
just some things to think about and check.
Currently Being ModeratedAug 2, 2011 9:19 AM (in response to Rowbi)Re: POD HD500 effects loop hiss
Well I'm not sure if analog to digital conversion should produce this much of hiss... Noise gate helps but still I want to know if this behavior is normal.
I know about signal doubling and noise when inputs are set incorrectly but, as I wrote before, the problem is present when there is no guitar connected so there is no input signal (but I also checked that). I tried connecting cables to the loop and connecting send with return but it didn't change anything. Basically the only amplified thing in my mp3 file is the effects loop return hiss.
I also tried switching every physical switch on the POD, changing options, turning knobs etc. to check if something affects this hiss but nothing did.
I tested this by following the instructions you provided to reproduce the added noise.
I had to turn my speakers to max to even hear the noise at all. I did hear it had some hiss when the FX block was added, but this is expected due to the added connections points and A/D D/A conversion. Combine that with putting it in front of a super high gain amp that is amplifying the noise significantly. If you remove the amp the noise disappears.
I do not feel that this will interfere with your tone due to how low the volume of the hiss is. If you were to play guitar during the sound file you attached, you will not be able to hear the hiss what so ever.
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