perx

I was rewiring and changing positions with different speakers when I noticed this:

The left signal output is higher than the right.

At first I thought it was faulty speakers, but I soon dialed up different synths and audio files and they all produced the same results. The left output volume is higher than the right.

Lets say I take a simple saw tooth waveform in a soft synth and pan it all the way to the left - I get a higher output (both audible and on the soft synths meters) on the left, than when I pan it to the right.
Same thing with audio files.

Im using MOTU MKII soundcards on cubase. I checked the different channels in cubase and even when they are in CENTER pan, I get this issue.

Anyone know what the problem could be?