ZRX Series: how to use the phase switch

The phase switch on your ZRX Series subwoofer lets you correct phasing issues between the sub and your main speakers. When a subwoofer is out of phase, its output can cancel against the mains, so the bass sounds thin or weak even at high volume.

If you connect your subwoofer and the low end feels weak, flip the phase switch and listen again. If the bass fills out and gets louder, leave the switch in that position. If it sounds the same or worse, switch it back. Set it wherever the bass sounds fullest at your listening position.