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No consumer audio equipment manufacturer named Dr. Hubert was found. Dr. Hubert GmbH exists in Germany (founded 1984 in Bochum) but manufactures industrial precision amplifiers for laboratory and EMC testing, not consumer audio. The brand name may be misremembered, extremely obscure, or a house brand. Without additional product information or time period, this appears to be either a non-existent or undocumented consumer audio brand.