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What is stereo?




There are now two system of high fidelity, monophonic (monaural) and stereophonic. Monophonic is a system that starts from one microphone and is fed through a single high fidelity set. Stereophonic is a double system. Two separate microphones are placed at different sides of the orchestra and two different systems are used to keep the two signals or channels separated. Two separate speakers are used, placed on different sides of you room. Stereo is much like 3-D photography, two slightly different sound reach your ears giving you a new dimension in sound.



H.H. Scott '59





Meridian 563

 The Meridian 563 Digital to Analogue Converter provides three digital inputs and one optical input, and uses a high definition dual differential digital to analogue Delta Sigma converter to give up to 19 bit precision. Dual phase lock loops ansure low jitter, and balanced Class A output amplifiers give extremely low distprtion.
 The Crystal Delta Sigma 1-bit DAC is designed as a one chip solution for stereo decoding, including its own high performance digital filter, oversampling and noise shaping. By using a pair of decoders in differential mode for left and right channels, Meridian claims a unique implementation giving a precision up to 19-bit resolution. A front-panel switch toggles a software phase inversion at this stage if the user desires, with the handbook pointing out that 'in some circumstances this can give a noticeable improvement in realism'.
 NE5534 ICs, bandwidth-limited via a 38 kHz single pole filter, feed Class A discrete output stages which provide two balanced outputs via XLR connectors as well as the two standard phono outputs. Each output circuit utilises A06/A56 high current driver transistors, easily capable of driving long cables with a source impedence of 12 ohms.
Specifications
Conversion:  Dual differential Delta Sigma, 64 times oversampled at 2 bits per channel giving 19 bits resolution
Jitter:  less than 1 ps rms
Noise and Distortion:  less than -95 dB
Inputs:
D1 - D3 digital audio :  unbalanced phono SPDIF input at 75 Ω
AES/EBU connection via optional XLR connection on D1
Optical disgital audio high speed
TOSLINK input
Outputs
Unbalanced analogue output 2 V nominal
Balanced anlogue output on 2 x XLRs
Display: illuminated legends for EQ, Lock, 44,1 kHz, and Phase
Finish:  Black textured enamel and glass
Dimensions (H x W x D):  88 x 321 x 332 mm (3.46" x 12.64" x 13.07").
Weight:  6.4 kg (14 lbs).
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