Abstract: A membrane cartridge for a dehumidification apparatus has a cartridge frame having an interior cavity and opposed face openings in fluid communication with the interior cavity. The frame has an edge with edge openings in fluid communication with the interior cavity and face openings. Inserts having perforated surfaces aligned with the face openings are bounded by borders adjacent the face openings. Membranes are attached to the cartridge frame over the inserts and face openings, the membranes sealed with respect to the face openings. A dehumidification apparatus that can employ the membrane cartridge has a housing with openings permitting a gas flow therethrough with the membrane cartridge parallel to the gas flow. A compressible seal is situated between the edge of the frame and the housing and a fastener between the housing and the membrane cartridge is configured to pull the membrane cartridge toward the housing to compress the seal.

Abstract: The present invention relates to the technical field of audio engineering, more specifically audio recording studio technique, radio and television broadcasting technique, the present invention comprising: a first plurality of input amplifier means, each of said input amplifier means having a first transformer means and a first buffer amplifier means, a second plurality of output amplifier means, each of said output amplifier means having a second transformer means and a second buffer amplifier means, switching means for interconnecting at least a single output of a specific input amplifier means and at least a single input of a specific output amplifier means for inputting said amplified and unbalanced signal from said specific input amplifier means to said specific output amplifier means.