A playback device includes an enclosure having a front face substantially normal to a first direction, a side-firing audio transducer facing a second direction that is angled with respect to the first direction, and a waveguide in fluid communication with the side-firing transducer. The waveguide includes a first chamber extending along a first axis and a second chamber extending along a second axis. The first and second central axes diverge along the second direction away from the side-firing transducer. The waveguide can be adjustable to vary the relative dimensions and/or orientations of the first and second chambers.