Musical instrument amplifiers; Loudspeakers with built in amplifiers; Woofers; Stereo amplifiers; Personal stereos; Sound recording apparatus; Megaphones; Amplifiers for musical instruments; Audio frequency amplifiers; Loudspeakers, headphones, microphones and CD players; Acoustic amplifiers; Audio speakers for automobiles; Car stereos; Equalizers being audio apparatus; Power amplifiers; Binaural microphones; Audio electronic components, namely, surround sound systems; Microphones; Audio equi...