Abstract: A thermoelectric cooling device has first and second sides which can act as hot and cold sides. Heat exchangers are preferably in thermal conductance with the first and second sides and air may be directed by fans past the heat exchangers. Closed fluid systems may also be used. Furthermore, improved heat sink constructions are believed to improve the efficiency of the thermoelectric device.

Abstract: A thermoelectric cooling device has first and second sides which can act as hot and cold sides. Heat exchangers are preferably in thermal conductance with the first and second sides and air may be directed by fans past the heat exchangers. Closed fluid systems may also be used. Furthermore, improved heat sink constructions are believed to improve the efficiency of the thermoelectric device.

Abstract: An acoustic loudspeaker cabinet enclosure has a woofer and a tweeter mounted on a front wall and a tuned port with a duct extending into the interior of the cabinet. A pair of tuned baffles are mounted within the cabinet, one of the baffles being secured to the rear wall within the peripheral envelope of the woofer and the other of the baffles being secured to the front wall approximately half way between the position of the duct and the woofer. The baffles have a plurality of reed fingers which are excited at predetermined frequencies to resonant thereby resulting in a controlled resonance developed by the air within the cabinet to provide a bass response more transient than that of conventional speaker systems, and a smoother, deeper, more natural response. The tuned baffles within the cabinet act to provide an internal tuning port within the cabinet similar to the conventional external tuning port. In the preferred embodiment the port and duct are positioned in the rear wall.