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These PS-BOOSTER modules are actually no independent Power Supply modules, since they only contain Supply capacitors. They are meant to assist the power supplies of our PA-3886ps and PA-4766ps modules in a case you use multiple amplifiers in a sandwich construction or if you want the best out of a single module with about the pest Power Supply you can get. With the extra supply capacitance bass response, etc. will improve. Due to the extra MKP capacitors over the power lines, high frequency shalrness is gone if there was any.
These booster modules have exactly the same size as the amplifier modules and are connected by three copper rods in the middle of the boards.