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OMNIA 6 EXi Analog Distorsion

S

stha

We have a problem with our Omnia 6 at the analog audio PGM. This is a distorsion on the right channel somewhere around 4khz. I could think it's a "simple" problem at the analog I/O card but if I switch the HD PGM to the analog output the problem disapears. If I try to switch the Analog PGM to the AES output, the distorsion is back again, the MPX output always have that problem. I tryed everything at the clipper stage but nothing better. Any idea ?
 
fm-engineer said:
I'm starting to see quite a few Vorsis boxes. They are advertising the crap out of them.
Click to expand...

Jeff Keith has put them on the path to success. Our VP8 is the best box I've heard in a long time.
 
I'm monitoring the audio at all the outputs, each time that the FM signal is routed somewhere (MPX,AES or analog) the distorsion is here (on both channels). After making further tests, it seems to be a clipper design. I have tested with my Omnia FM Hot and I have the same distorsion. To me, it comes from the clipper design. Anybody could get the same results, just put an audio 4khz input (I'm using the Optimod 6200 DAB output filter to drive the O6 for that test) then just compare with any Omnia preset (but let's say the Rock'N'Roll) and switch between the HD and FM outputs...
 
stha said:
I'm monitoring the audio at all the outputs, each time that the FM signal is routed somewhere (MPX,AES or analog) the distorsion is here (on both channels). After making further tests, it seems to be a clipper design. I have tested with my Omnia FM Hot and I have the same distorsion. To me, it comes from the clipper design. Anybody could get the same results, just put an audio 4khz input (I'm using the Optimod 6200 DAB output filter to drive the O6 for that test) then just compare with any Omnia preset (but let's say the Rock'N'Roll) and switch between the HD and FM outputs...
Click to expand...

Not sure what you're trying to prove...

The Omnia outputs for FM employ clipping, and at some point will generate distortion on a tone. The HD output employs look-ahead limiting which yields a sinewave output. The limiters are designed differently for their respective applications.

-Frank Foti
 
Thank your Franck for considering my question. I know that FM outputs employ clipping and that's why I was suspecting this part of the priocessing, but I'm surprised because the distortion can be heard at very low level if the Clippier Drive is at minimum... It's not only with sinewaves because this king of distortion was audible in some passages in music with female voices or some instruments. I just try to reduce this effect.
 
stha, i thought you were using an Ariane in front of the 6exi? But, i think i know the problem.Too much "Beastie Boys"and "Motley Crew" being played through it.(ha).Some how your post doesn't pass the SMELL test.heard the story about the mountain and the moe hill??So did you measure the distortion and if so how much was it?Could it be your test method?
 
oldiesstation said:
stha, i thought you were using an Ariane in front of the 6exi? But, i think i know the problem.Too much "Beastie Boys"and "Motley Crew" being played through it.(ha).Some how your post doesn't pass the SMELL test.heard the story about the mountain and the moe hill??So did you measure the distortion and if so how much was it?Could it be your test method?
Click to expand...

Ah...A note about testing audio processors. Trying to pass test tones through processors when the dynamics are engaged will produce inconsistent results. We offer info about testing in the manual, and recommend following those guidelines.

Also, trying to 'test' a processor, when there's something else in fdront of the unit, in question, does not make sense.
 
stha said:
Thank your Franck for considering my question. I know that FM outputs employ clipping and that's why I was suspecting this part of the priocessing, but I'm surprised because the distortion can be heard at very low level if the Clippier Drive is at minimum... It's not only with sinewaves because this king of distortion was audible in some passages in music with female voices or some instruments. I just try to reduce this effect.
Click to expand...

Something doesn't add up. I can dial down the processing, and the audio is crystal clear. If you think something is wrong with your unit, please contact our Support Dept for assistance.
 
Re: OMNIA 6 Exi Fm path distortion

FFoti1 said:
Something doesn't add up. I can dial down the processing, and the audio is crystal clear. If you think something is wrong with your unit, please contact our Support Dept for assistance.
Click to expand...

I will make a new test with a sinewave to the Omnia 6 alone using the Rock'n'Roll preset. Then, I will record the FM path at the AES output and post the link. Please just let me know if the result is normal or if my unit need service. As I can get the same kind of result with my OmniaFM Hot, I want to know if it's only a normal clipper effect that I don't like but that could be worse again with some other boxes (just to say that I have nothing at all against your products ! ).
 
Re: OMNIA 6 Exi Fm path distortion

stha said:
I will make a new test with a sinewave to the Omnia 6 alone using the Rock'n'Roll preset. Then, I will record the FM path at the AES output and post the link. Please just let me know if the result is normal or if my unit need service. As I can get the same kind of result with my OmniaFM Hot, I want to know if it's only a normal clipper effect that I don't like but that could be worse again with some other boxes (just to say that I have nothing at all against your products ! ).
Click to expand...

Before making another test, please contact our Support Dept. It's not as easy as connecting tone to the unit and posting a waveform. The dynamics sections, in the Omnia, will behave differently based upon input level, etc. Also, I don't trust file based tests.
 
I've been watching this discussion, and I'm confused. I agree with Frank and the others. Call one of our support guys in the morning, and discuss with them.

This just seems to be something that is better discussed verbally rather than going back and forth on a website forum. Something here is being "lost in the translation", and I'm usually pretty good at "figuring out what"...but it just isn't working here. Save yourself lots of time & aggravation, and discuss with the support guys on the phone.

241.241.3343

-Cornelius
 
Dude,

RTFM. This is no secret, you can't have everything. There are tradeoffs!

In the manual there should be a section called "Quality Vs Loudness" that discusses this exact issue.
 
RealityCheckr is right. Other tests with different audio processors are giving the same kind of results (not only Omnias...). This is an harmonic distorsion introduced by the clipper and ANY clipper (as far as I know). But I'm still surprised to see how this effect is perceptible in some conditions, even if the clipper drive is at the minimum. Again, it was not against the Omnia processor, only because it's the one I have.
 
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