Can a dipole woofer be placed in a room corner?
A30 – A dipole placed in a room corner should provide minimal excitation of room modes or resonances. The corner is a region of maximum sound pressure and it is well known that a typical monopole woofer in this location will couple optimally to all room modes. A monopole woofer would be a high impedance pressure source in the high impedance region of all wave modes (Z = p/v) and be optimally adapted to support them. A corner dipole, being a velocity and low impedance source, would have minimal coupling to room modes. Unfortunately, the H-frame and W-frame dipole woofers described for the PHOENIX cannot be placed completely into a room corner, because it would block their rear radiation. A minimum distance of 3 feet (1 m) must be maintained. L. E. Selmer (larryeselmer@netscape.net) proposes a corner dipole woofer that uses a different baffle arrangement and makes full use of a room corner. He claims that the sound from his first prototype shows exciting promise. I post his idea here for
