Quad 66 systeem

Stereoset:
Quad 66 preamplifier
Quad 67 cd-player
Quad 606 mono amplifiers
Quad ESL-63 speakers
Gradient SW-63
Remote

= Quad 66 preamplifier =

The Quad 66 is a high quality preamplifier system with full remote control operation.

It comprises two units; a mains operated preamp to which the various sound sources are connected and a separate battery operated control panel incorporating all the main function controls for operating the preamp and Quad CD player, or any other remote control CD player using the same remote control language.

If the battery fails the control panel can be directly powered from the preamp. A display on the main unit shows all functions selected.

The unit will accept inputs from seven sources; Disc, CD Radio, AV, Aux 1, Aux 2 and Tape (with off tape monitoring).

A second tape recorder may be connected to the Aux 2 input and both the AV and Aux 1 inputs have anti hum-loop circuitry.

The control panel has rotary volume and balance adjustment plus press buttons for Disc, CD play, Radio, AV, Aux 1 and 2, Tape, Tilt (2), Bass Step (2), Filter (2), Cancel, Standby, Search (2), Track, Pause, Stop and Store.

The standby facility enables the 66, and any other equipment connected to the AC auxiliary outlet, to be switched on and off via the remote control panel.

= Quad 606 mono amplifiers =

The Quad 606 is a two-channel power amplifier designed for high quality sound reproduction when used with a Quad 66 control unit or other source.

While Quad high fidelity equipment is designed to reproduce music at realistic levels, there is a world of difference between the sound pressure levels produced by a string quartet and a heavy metal group.

Please be aware that very high sound pressure levels will also cause severe annoyance to neighbours.

= Quad ESL-63 speakers =

This speaker consists of two fixed electrodes and a diaphragm placed between them.
When a high voltage is applied to the vibrating membrane to generate static electricity and an audio signal is sent to the fixed electrode, a Coulomb force acts between the vibrating membrane and the fixed electrode to move the vibrating membrane and produce sound.
This method does not require any strength because the diaphragm moves uniformly over the entire surface. It can be set to a very light diaphragm and can be driven with very little energy. It also has advantages such as good impedance matching with air and no need for a cabinet.
The ESL-63 has succeeded in generating all frequencies at one point based on this system.

Since a general electrostatic speaker is plane driven and tends to be plane wave, the listening position was limited.
To solve this problem, in the ESL-63, the fixed electrode is divided into seven concentric rings and a delay circuit is set for each of them. By generating a signal delay of approximately 24 usec per stage from the inner circumference to the outer circumference, for a total of approximately 168 sec, we have succeeded in generating a spherical wave from a flat vibrating membrane. By this, the sound source is located approximately 30 cm behind the vibrating membrane and can freely respond to changes in directivity caused by changes in frequency.

= Gradient SW-63 =

Gradient is a Finnish brand. It is a pair of sub each with two speakers configured for dipole inserted in a cabinet designed to mate perfectly to the Quad 63 also reaching the important purpose of bringing the Quads to a more correct height from the ground. The set is very nice and seems to have in front of a single speaker.

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= Quad 66 preamplifier =

Frequency response: 15Hz to 20kHz
Total harmonic distortion: 0.05%
Input sensitivity: 3mV (MM), 300mV (line)
Signal to noise ratio: 74dB (MM), 93dB (line)
Output: 300mV (line), 0.5V (Pre out)
Dimensions: 321 x 80 x 255mm
Weight: 3.3kg
Year: 1993

= Quad 67 cd-player =

Disc format: CD
Digital converter: Delta Sigma, 18 bit, 64 x oversampling
Frequency response: 20Hz to 20kHz
Signal to Noise Ratio: 100dB
Channel separation: 100dB
Total harmonic distortion: 0.002%
Line output: 2V
Dimensions: 321 x 80 x 240mm
Weight: 3.5kg
Accessories: infrared remote control
Year: 1993

= Quad 606 mono amplifiers =

Power output: 140 watts per channel into 8ohm (stereo)
Frequency response: 20Hz to 20kHz
Total harmonic distortion: 0.03%
Input sensitivity: 0.5V
Signal to noise ratio: 105dB
Speaker load impedance: 4ohm (minimum)
Dimensions: 321 x 140 x 238mm
Weight: 12kg

= Quad ESL-63 =

Type Condenser type, floor type
Nominal impedance 8 ohm
Playback frequency band 35 Hz to 20 kHz
(-6dB at 35 Hz, -6dB at 20 kHz)
Output sound pressure level 86dB/W/m
Sensitivity 1 bars/V/m (86dB/2.83 Vrms)
Max Input Maximum continuous input voltage : 10 Vrms
Maximum peak input during program to obtain distortionless output : 40 V
Maximum allowable peak input : 55 V
Maximum power output 2N/m2(2m on axis)
Directional property 125Hz:5dB
500Hz:6.4dB
2kHz:7.2dB
8kHz:10.6dB
External dimensions 660 mm wide x 925 mm high x 270 mm deep (including 150 mm base plate)
Weight 18.7kg