Peter Walker´s description of the electrostatic loudspeaker in Wireless World Magazin attracts great attentions, worldwide. 2 years later, in 1957, half a dozen journalists get the chance to hear the ESL in the London Waldorf Hotel. The QUAD II is still used as an amplifier. Later in 1967 the first 303/33 come to market. Given that in the early 50s the QUAD I (still under the name Acoustical) and a suitable control unit are still in production, those two decades certainly can be referred to as very intensive times for QUAD.