The STUDIO ART Subwoofer B100 is the perfect partner for the A100 and P100 when you demand even more impressive bass performance. This is made possible by the innovative chassis and the downfire principle (with the floor as the radiation surface), as well as the special cabinet construction with dual ports for extremely precise bass reproduction. Conveniently, you can control the phase adjustment and bass intensity directly from your listening and seating position using the Revox app.