Quad the closest approach pdf

A world leader in audio amplifier and electrostatic speaker design, Quad has, over the years, made a major contribution to the improvement of sound quality. For many people, buying their first Quad sound system can be a life changing experience. They enjoy the confidence of knowing that the complete system has been engineered to achieve optimal performance, free from compatibility problems. They derive pleasure from knowing that Quad is a company of individuals who care about both the design and construction of their products, while sharing their love of music.

These are just some of the reasons why Quad now serve the children and even grandchildren of their first customers. The history of Quad is one of technical achievement in the field of sound reproduction. It is a story that began with the Quad 1 amplifier, which brought the benefits of 15 years knowledge and experience in professional audio and industrial products to the task of making the most accurate domestic audio amplifier of its age.

This amplifier pioneered the principle of cathode coupling through the output transformer to reduce harmonic distortion to almost negligible levels. Such was its clear superiority that this model remained in production for 18 years. Three years later, in , Quad demonstrated the first true full-range electrostatic loudspeaker.

This remarkable product known later as the ESL 57 used a virtually mass-less plastic film as a moving diaphragm between two charged plates. Compared with moving coil loudspeakers, the ESL 57 was free of unwanted colourations and distortions. This landmark product remained in production, virtually unchanged, for 28 years. This means that a small "chamber" is actually formed at the rear of the panel, and this, plus the acoustic resistance of the felt itself, considerably increases the acoustic efficiency of the treble panel.

Aiming The speakers should have the treble panel centres "aimed" directly at each of the listener's ears.

This is in both the vertical and horizontal dimensions. This is not a particularly "social" speaker in terms of the so-called "sweet spot". When you have the "aiming" correct in both planes, you will know you have it right. The sound stage depth will be huge and the placement of performers within the sound stage will be pin-point accurate.

The acoustic treatment of the room can aid in the overall listening experience immensely, and I don't care whose speakers you're using! The Quads, being a co-sinusoidal radiator are not as affected by room placement as box speakers. They do not excite vertical or lateral resonances very much. However, there is the long-dimension resonance to deal with and perhaps the "deadening" of exterior acoustic interference to consider.

Polyester panels and tube traps can help. DIY these need not cost very much. Ordinary roof insulation batting will do nicely. I do not recommend fibreglass because of the fibre hazard it presents. You can see these types of acoustic treatment on this site - My Quads. Room Positioning The Floor The original Quad was mounted, stock standard on three little oak legs, so that it stood about 4 inches from the floor.

Room Treatment The acoustic treatment of the room can aid in the overall listening experience immensely, and I don't care whose speakers you're using!

Radical in both circuit design and appearance, they went on to win a Design Council Award in This remarkable new circuit topology remains one of the few truly original amplifier designs and has featured in Quad products ever since. Numerous other prestigious awards were presented to Quad from all over the world. In Quad announced the ESL 63; a full-range electrostatic loudspeaker based upon two sets of concentric annular electrodes fed through sequential.

This patented system produces a sound pressure pattern identical to the theoretical ideal of a point source origin. Once again a Quad electrostatic loudspeaker became the reference standard around the world. The arrival of the radical 77 Series in introduced the concept of a fully integrated sound system operated with a two-way remote control system. The system boasted numerous new types of circuit technology as well as some of the most advanced control software seen in a consumer product.