Quad 77 CD
Stereo Compact Disc Player (1995)
The Quad 77 compact disc player uses a Philips CDM 12.4 transport and Delta Sigma modulation decoder to provide a player which has a measured performance very close to the theoretical optimum and with very high tolerance of damaged or faulty discs.
The CDM 12.4 transport is extremely well engineered and produces a very low error output even with badly marked or out of specification discs. It is also very quiet in operation.
Delta Sigma modulation is a variation on Bitstream technology. The chief advantage of the Delta Sigma chip is that the accuracy of conversion is not dependent upon the accuracy of the masted clock and is thus not susceptible to clock jitter, which makes the task of the design engineer somewhat easier. However, with digital technology it is not the terminology which matters as much as quality engineering.
The Quad 77 is available in bus powered and mains powered form. The bus powered unit can only be used as part of a Quad 77 system and is supplied with a Quadlink cable. The mains powered version comes with phono and bus connections and standard remote control.
Disc format: CD
Digital converter: CS4328-KP, 18 bit Delta Sigma
CD Mechanism: CDM 12.4
Frequency response: 20Hz to 20kHz
Signal to Noise Ratio: 100dB
Total harmonic distortion: 0.002%
Line output: 2V
Dimensions: 321 x 65 x 300mm
Finish: carbon or nextel front panel
Price: GBP £700 (1995)
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