I have changed woofers in two Beolab 6000. There was a paper in the box, saying something about adjusting volt after changing them. Does anyone know how to do that? I have a digital voltmeter, does that help? I can cut a powerlinkcable if that is a solution.

You will need an audio signal generator as well as the DVM to do the job.

If you dont have the equipment then just leave the adjustment alone. You will probably quite appreciate the bass boost that is normally achieved!