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BIzarre!? - Peaks of audio file higher in the negative side...

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I've just been recording some bass today through my Avalon 737 into a Metric Halo ULN-2....
When i look at the audio file in sample editor it seems that the peaks are noticeably higher on the negative side of the waveform. - The file 'clipped' and reached (-100) many times but only (+100) on a handful of occasions...
Is this normal or is there something wrong with the preamp or audio interface?
many thanks
J

Answers

RoughIsland wrote:
Hello again,
Ok, I've done a quick test today for two things:
1. DC offset - logic analysed the tracks and said 'no dc offset found'. Although the troughs seem to be noticeably bigger than the peaks at the start of the notes, towards the end of the notes (bass gtr) the peaks were higher than the troughs. - i suppose this cancels out over the duration of the full note?
Then you do NOT have and DC voltage issues. From now on, IGNORE any and all comments on DC offset. You don't have any. This is a good thing.
2. However, I've looked at every note and each one starts with a trough when first plucked - so assume i have -ve phase in my setup from what you previously said - this is the case with both the preamps in the ULN-2 and with the Avalon 737 as a pre and using the ULN2 as just an AD convertor.
I suspect bad wiring. Check the wiring for your equipment, and FOLLOW what the mfr recommends you should use for their equipment.
MOST (99%) of gear that has BALANCED wiring, is wired as follows:
For an XLR connector :
PIN 1 = GROUND
PIN 2 = COLD voltage.
PIN 3 = HOT voltage.
For TRS (1/4" Tip-Ring-Sleeve) connectors:
SLEEVE = GROUND
RING = COLD voltage.
TIP = HOT voltage.
Cheers
Is there anyway that I could reverse the phase that's coming from the ULN 2 going into the computer?
Yes. Re-wire your setup. Someone is not playgin nice with the pinouts...
I can only assume negative phase in the audio files would be a problem if the > software instruments produce positive phase audio when playing?
Absolutely. this is probably why, when you mix, some notes sound thin, while others sound too big and boomy. And you have to do extreme EQing to correct the issue.
Does that make any sense?!
It does to me.
thanks again for all your help,
J
Cheers

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