What is this about? in calibration

[MindDead]

I'm calibrating the INs on my HD I/O and this happens. Look at this picture. Why are IN's 4-5 in the 700's in the meter? when I tweak the input trim(the tiny screw on the back 1-8 IN's) the signal only goes from 600-700+, and I can't get it to go below. Is the card broken? Are my settings wrong for the session? The D25 cable is brand new.



Changed cables, same thing happens.

BTW in the Calibration session the Avid provides, the Pan of the signal generator track is full Left, that how it should be? Why would it be Full Left? I makes a difference in the outgoing db in the meters when I center it or Full Right the Pan.

Please help!

[MindDead]

I don't think its the card either, because I tried the same calibration on the 2nd Analog IN's and the same thing happens! only on the 4-5 IN's which are 12-13 on the 2nd card.

I'm freaking stumped.

[YYR123]

How is your setup, setup? Hardware setup, is in one of the menu's I forget

[MindDead]

Originally Posted by YYR123

How is your setup, setup? Hardware setup, is in one of the menu's I forget

All set to default.

[Rich Breen]

Yes, pan on signal generator source should be full left - it's a stereo aux so pan needs to be hard left for correct level; read about pan law.

No idea what you've got going on between outputs and inputs, so no way to figure out why those out/in pairs are hot. Have you measured with a DVM at the outputs that are feeding these input pairs? How are you getting from outputs to inputs? A direct DB25 to DB25? Patch Bay? XL snakes? Way too many variables to speculate about what's going on there.

I've said before to you in another post - it doesn't sound to me like you have enough tech knowledge to be doing this yourself; you should hire a competent studio tech for an hour and get your system correctly calibrated. Then read up on all this.

[MindDead]

Originally Posted by Rich Breen

Yes, pan on signal generator source should be full left - it's a stereo aux so pan needs to be hard left for correct level; read about pan law.

No idea what you've got going on between outputs and inputs, so no way to figure out why those out/in pairs are hot. Have you measured with a DVM at the outputs that are feeding these input pairs? How are you getting from outputs to inputs? A direct DB25 to DB25? Patch Bay? XL snakes? Way too many variables to speculate about what's going on there.

I've said before to you in another post - it doesn't sound to me like you have enough tech knowledge to be doing this yourself; you should hire a competent studio tech for an hour and get your system correctly calibrated. Then read up on all this.

I've calibrated the outputs with a analog VU meter, their fine. I'm going out from a DB25 to XLRF to XLRM to DB25 in. No patch bay.

[YYR123]

Originally Posted by MindDead

I've calibrated the outputs with a analog VU meter, their fine.

What was it? The reading, and what are you calibrating to? What level?

Edit, you said analog VU meter and I thought you said digital voltage meter.

Same analog VU meter? For all channels?

I would also recommend checking the voltages out with the voltmeter- just for sanity checks

[MindDead]

Originally Posted by YYR123

What was it? The reading, and what are you calibrating to? What level?

Edit, you said analog VU meter and I thought you said digital voltage meter.

Same analog VU meter? For all channels?

I would also recommend checking the voltages out with the voltmeter- just for sanity checks

On the analog VU meter, which is what the manual says to calibrate by, I'm calibrating to 0. In Pro Tools HD the meters read -18dbFS, except the 2 I'm having issues with.

[YYR123]

Why don't you ohm out the cable just for fun.....but I don't think that's the issue

You have to check the output card, for those 2 outputs


Also you can try this to narrow down the problem. I'm going to speak in general terms.....

Take a known good output input combo channels, let's say output 1 and input 1

Now assume you have problems with input 4.

Now take output 1 and connect it to Input 4....what does it read?

Same as Input 1? Then it's the Output 4 causing issues.

Same as Input 4 with the problem? Then it's the Input 4 causing issues.

[MindDead]

Originally Posted by Rich Breen

I've said before to you in another post - it doesn't sound to me like you have enough tech knowledge to be doing this yourself; you should hire a competent studio tech for an hour and get your system correctly calibrated. Then read up on all this.

If you consider yourself a competent studio tech, then someone taught you didn't they? I'm pretty sure this is a "help each other in anyway we can and learn" AVID forum, but maybe it's a "your not competent enough, go get help someone else forum"?

I've been in audio for along time, not professionally, but I've learned everything I know from online resources and kind ppl from this board. Where would any of us be if more knowladgeable ppl did't take the time to be kind and help us when we knew nothing?