Abstract: A loudspeaker component includes a unitary plastic element that defines at least a portion of (i) a first acoustic volume that can be acoustically energized by an electro-acoustic driver, (ii) a first port which extends from the first acoustic volume and conducts acoustic energy from the first acoustic volume towards an environment external to a loudspeaker in which the plastic element resides, and (iii) a second port which conducts acoustic energy from a second acoustic volume, defined by the loudspeaker, towards the external environment.

Abstract: A loudspeaker component includes a unitary plastic element that defines at least a portion of (i) a first acoustic volume that can be acoustically energized by an electro-acoustic driver, (ii) a first port which extends from the first acoustic volume and conducts acoustic energy from the first acoustic volume towards an environment external to a loudspeaker in which the plastic element resides, and (iii) a second port which conducts acoustic energy from a second acoustic volume, defined by the loudspeaker, towards the external environment.

Abstract: A magnetic disc cartridge includes two sets of opposing ribs arranged on opposite sides of the cartridge so that each rib of one set of ribs is skew with respect to each rib of the other set of ribs. The ribs exert pressure on both sides of a rotating medium via wiper elements, which sandwich the medium, so as to clean debris from both sides of the medium while maintaining medium planarity in a region defined between the two sets of opposing ribs. Optionally, each rib of the one set of ribs may cross perpendicularly with respect to each rib of the other of the sets of ribs.