How does the 85 Hz test tone work?
When the connection to the Genelec Bass Management System is properly done, it is possible and necessary to adjust the Phase at the crossover point once the multi-channel system is set-up in the room. Genelec Bass Management System allows for 0, 90, 180 or 270 degrees phase shifts @ 85 Hz.
This guarantees that the main loudspeakers and the subwoofer are in phase at the 85 Hz crossover point. An 85 Hz tone generator is provided in the Genelec bass manager so that it is easy to do the necessary on-site phase adjustments
This Phase adjustment has to be done for each subwoofer placed in the room, as they possibly will have different phase adjustments depending on their different physical location in the control room relative to the main loudspeakers. This is especially important in the case where one uses a master/slave subwoofer configuration. Consult the subwoofer's Quick Set-up Guide for the phase adjustment procedure.