I suggested a better idea in a previous post:
A NADD (Neighbouring Apartment Dispersal Device) is designed especially for music nuts who live in apartments, have very expensive, high-quality hi-fi components, but feel constrained to push up the volume to 11 due to the adjoining presence of people who simply don't give a **** about music quality and just want their lives to roll along in audiophile-ignorant bliss, as peaceful as a serene punt down an English river in midsummer.
It works by emitting an ultrasound dispersal beam in all directions (away from the source) that causes such intense pain to any nearby apartment residents that they move out (or, potential renters never move in upon their first inspection); hence, the end result is you're now surrounded (ho ho) by empty apartments and can enjoy your music at whatever level you desire.
Admittedly, the NADD hasn't been invented yet, but
@chucky3042 now knows what his next project is.