Quad are one of the main pioneers of Hi-Fi, founded way back in 1936 by Peter Walker, they’ve release many unique and cutting edge products over the years.

Quad II Classic
Key products: Quad ESL 57 electrostatic speakers, Quad II Classic mono block valve amps, Quad 33 303 pre/power amplifiers.
Hunt down: Quad
Official Website: www.quad-hifi.co.uk
Fan site dedicated to the Quad ESL electrostatic speakers: www.quadesl.org