Pro Tools output levels not matching

[Drumman082]

Hi all -

I just started working at a new facility and I'm having an issue with the output levels from Pro Tools not being even. Here is the necessary tech info:

Soundcraft Ghost console
Mac Pro (10.6.7) 2x2.66 GHz Dual Core Intel Xeon
16 GB 667 MHz DDR2 RAM
Pro Tools HD 8.04 with 2x192 Interfaces

Output 1 from Pro Tools is coming in at roughly 2-3 db louder than Output 2. This occurs both in Pro Tools and if I play something through iTunes or anything else requiring the CoreAudio Manager. When I switch to Outputs 3-4 both in Pro Tools and setting Audio MIDI Setup to Output Streams 3-4 (for computer playback), the signals are even. I have ensured that no signal is being doubled from Channel 1 on the Ghost and that everything is either zeroed or at unity.

I can compensate by lowering the output of Channel 1 on the console, but that doesn't change the fact that the meter bridge is still reading the left channel hotter than the right.

This has been an issue since I started here and I cannot, for the life of me, figure this out. I am fairly positive this is an issue from Pro Tools, but cannot trace it. Does anyone have any suggestions?

Thank you in advance.

[Park Seward]

Try changing the input 1 cable. Or just swap 1 and 2 cables and see if the problem follows.

[Drumman082]

I swapped cables and yes, the problem follows.

[Park Seward]

So the meter bridge on the 192 is showing a higher level? I don't have a 192 but can you do any internal trims?

[Park Seward]

This is the PT9 forum. You may have better luck going to the HD forum. But I did find this in the set-up drive:

Each of the analog channels in the 192 I/O has two Input Trims, labeled A and B, for precisely calibrating and switching levels. You can select Input Trim A or B on a chan- nel-by-channel basis. Refer to the 192 I/O Guide for information on setting the rear panel trims.

[Drumman082]

Yessir you are correct. I just checked into this and found the same document online that you are referring to. Time to bust out my meter and do some calibration!

Thank you kindly for your assistance

[LanceK]

Hold on before you do anything: you said the fault follows the cable, therefore your fault IS the cable.

[Park Seward]

I think he just swapped one end. He didn't replace the cable: it remained connected at the 192 end.