An acoustic transmission line is the use of a long duct, which acts as an acoustic waveguide and is used to produce or transmit sound in an undistorted manner.
An amplifier, electronic amplifier or (informally) amp is an electronic device that can increase the power of a signal (a time-varying voltage or current).
Bristol is a city and county in South West England with a population of 456,000.
A CD player is an electronic device that plays audio compact discs, which are a digital optical disc data storage format.
High fidelity (often shortened to hi-fi or hifi) is a term used by listeners, audiophiles and home audio enthusiasts to refer to high-quality reproduction of sound.
A loudspeaker (or loud-speaker or speaker) is an electroacoustic transducer; which converts an electrical audio signal into a corresponding sound.
A transformer is a static electrical device that transfers electrical energy between two or more circuits through electromagnetic induction.
A transistor is a semiconductor device used to amplify or switch electronic signals and electrical power.
Tube sound (or valve sound) is the characteristic sound associated with a vacuum tube amplifier (valve amplifier in British English), a vacuum tube-based audio amplifier.
A valve amplifier or tube amplifier is a type of electronic amplifier that uses vacuum tubes to increase the amplitude or power of a signal.
A valve audio amplifier (UK) or vacuum tube audio amplifier (United States) is a valve amplifier used for sound reinforcement, sound recording and reproduction.