MARSHALL GAIN

Electrical and electronic audio apparatus and instruments, namely, audio frequency voltage amplifiers, audio frequency signal processors including filters, amplifiers, frequency shifters, signal storage and playback units, signal mixers, audio frequency power amplifiers for driving a loudspeaker load, all for audio amplification, for the graphic equalisation of sound signal frequencies, for mixing sound tones, altering sound tones, or effecting echo, delay and other effects; apparatus for recording, transmission, amplifying and/or reproduction of sound; headphones; ear phones; wireless headphones; noise cancelling headphones; in-ear headphones; cases for headphones; ear pads for headphones; adapter cables for headphones; two-way plugs for headphones; headphones for use with sound transmitting systems; headphone amplifiers; headphone consoles; audio speakers; loud speakers; loud speaker cabinets; car speakers; wireless speakers; portable speakers