Thanks, while I am familiar with the uses and pros/cons of bi-amping and bi wiring, I'm looking for the technical side of the biwiring mistake of biwiring and not pulling the bridge clips from the speakers.
Thanks
The cables meet at both ends- it doesn't matter and it won't cause a problem. If two different channels had been used, it could cause problems.
Turn the amp off, check the resistance from each cable + to the other, then repeat it and measure between the - cables. You should see zero Ohms, or very close to it. Then repeat the measurements at the speaker end- you should see zero Ohms, or very close to it.
Seems that this was done by someone who really doesn't understand bi-wiring OR bi-amping.