Active and passive sub woofers; active and passive audio speaker enclosures; sound amplifiers; [ electronic sound mixing, ] processing and synthesizing apparatus; electronic products for the manipulation of the frequency, time and amplitude characteristics of audio signals, namely, audio processors; pre amplifiers; audio receivers; electronic effect pedals for use with sound amplifiers; electric wires and cables for the aforementioned goods; software to control and improve audio equipment sound quality; headphones [ ; microphones ]