An acoustic waveguide (6, 41, 70, 106, 206) for use with a first driver that generates midrange sound signals and a second driver that generates high-frequency sound signals, the acoustic waveguide (6, 41, 70, 106, 206) comprises: a first mounting location (22, 80) at a top surface of the acoustic waveguide (6, 41, 70, 106, 206) and configured to connect to the first driver; a second mounting location (24, 82) at a rear surface of the acoustic waveguide (6, 41, 70, 106, 206) and configured to connect to the second driver; a first plurality of openings (16, 66a-f, 116a-f, 286a-f) in a front surface of the acoustic waveguide (6, 41, 70, 106, 206); a second plurality of openings (18, 68a-f, 118a-f, 288) in the front surface of the acoustic waveguide (6, 41, 70, 106, 206), wherein the first plurality of openings (16, 66a-f, 116a-f, 286a-f) is interleaved with the second plurality of openings (18, 68a-f, 118a-f, 288); a first plurality of sound channels (30a-e, 130a-e, 230a-e) coupled to the first plurality of openings (16, 66a-f, 116a-f, 286a-f) and to the first mounting location (22, 80), wherein the first plurality of sound channels (30a-e, 130a-e, 230a-e) are configured to carry the midrange sound signals from the first driver to the first plurality of openings (16, 66a-f, 116a-f, 286a-f); and a second plurality of sound channels (32a-d, 132a-d, 232a-d) coupled to the second mounting location (24, 82) and the second plurality of openings (18, 68a-f, 118a-f, 288), wherein the second plurality of sound channels (32a-d, 132a-d, 232a-d) are isolated from the first plurality of sound channels (30a-e, 130a-e, 230a-e) and are configured to carry the high-frequency sound signals from the second driver to the second plurality of openings (18, 68a-f, 118a-f, 288), wherein each sound channel of the second plurality of sound channels (32a-d, 132a-d, 232a-d) has a path length substantially equal to the path lengths of the other sound channels of the second plurality of sound channels (32a-d, 132a-d, 232a-d). a first mounting location (22, 80) at a top surface of the acoustic waveguide (6, 41, 70, 106, 206) and configured to connect to the first driver; a second mounting location (24, 82) at a rear surface of the acoustic waveguide (6, 41, 70, 106, 206) and configured to connect to the second driver; a first plurality of openings (16, 66a-f, 116a-f, 286a-f) in a front surface of the acoustic waveguide (6, 41, 70, 106, 206); a second plurality of openings (18, 68a-f, 118a-f, 288) in the front surface of the acoustic waveguide (6, 41, 70, 106, 206), wherein the first plurality of openings (16, 66a-f, 116a-f, 286a-f) is interleaved with the second plurality of openings (18, 68a-f, 118a-f, 288); a first plurality of sound channels (30a-e, 130a-e, 230a-e) coupled to the first plurality of openings (16, 66a-f, 116a-f, 286a-f) and to the first mounting location (22, 80), wherein the first plurality of sound channels (30a-e, 130a-e, 230a-e) are configured to carry the midrange sound signals from the first driver to the first plurality of openings (16, 66a-f, 116a-f, 286a-f); and a second plurality of sound channels (32a-d, 132a-d, 232a-d) coupled to the second mounting location (24, 82) and the second plurality of openings (18, 68a-f, 118a-f, 288), wherein the second plurality of sound channels (32a-d, 132a-d, 232a-d) are isolated from the first plurality of sound channels (30a-e, 130a-e, 230a-e) and are configured to carry the high-frequency sound signals from the second driver to the second plurality of openings (18, 68a-f, 118a-f, 288), wherein each sound channel of the second plurality of sound channels (32a-d, 132a-d, 232a-d) has a path length substantially equal to the path lengths of the other sound channels of the second plurality of sound channels (32a-d, 132a-d, 232a-d).