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

Marantz CDA - 94

Digital source selector,

Autochange multisampling at 32,44.1 and 48 kHz,

16-bit 4-times oversampling Digital Filter,

twin 16-bit Digital-to-Analogue converter,

Optical coupling and electronic digital inputs,

L-R independent output Amplifier,

precision analogue filters,

Balanced, variable and fixed analogue outputs,

Digital monitor input/output,

3 separate power supplies,

Customized components.

The CDA-94 is the world's first D/A conventer with multisamplig, for conversion of CD, DAT and Broadcast Satellite signals with 16-bit 4-times oversampling accuracy, and with high-precision analogue circuitry.

One Toslink coupler and two 75 ohm coaxial sockets provide digital input connections in addition, there are digital tape input and output monitor socjets; standarized connections for all the present and envisaged digital audio sources.

Absolute Phase Control

It is possible for a variety of reasons, for the absolute phase of the original music to become inverted by some part of the recording process. The absolute Phase Control allows such an inversion to be corrected digitally to restore the original harmony ofthe music. This is especially valuable for vocal performances.

The autochange circuit automatically adjusts the sampling frequency to siut the selected input 44.1 kHz for compact Disc, 48 kHz and 32 kHz for DAT and the anticipated Broadcast Satellite.

The high performance of the Marantz 16-bit 4 times oversampling digital filter and twin 16-bit D/A converter are further accentuated by optical coupling between the digital filter and the D/A converter, by high precision analogue filter and by L/R independent amplifier circuits.

Analogue Outputs

Three different forms of analogue output are provided:

Balanced output using 600 ohm output line transformer.

Fixed output. Variable output (controlled by high-precision conductive plastic potentimeter) for direct connection to power amplifier.

The circuits are based on Marantz high-technology audio engineering know-how. Three separate printed circuit boards carry the Digital input-output section, the D/A converter section and the analogue amplifiers.

These circuits are supported by three separate power transformers for total circuit separation and protection from interference and cross-coupling. The analogue circuit transformer is a special high-efficiency toroid. Furthermore carefully chosen customized components ensure the very highest performance . They include ELNA electrolityc capacitors with ceramic powder filling and damped copper styrol film damped capacitors for the analogue circuits. Capacitor leads are not of tinned steel but oxygen-free copper.

The chassis of non-magnetic diecast aluminium, provides the high rigidity to ensure absence of acoustic feedback, it also suppresses eddy current coupling.

Specifications for Marantz CDA-94

Sampling frequency: 32 kHz, 44.1 kHz, 48 kHz (automatic switchover)

Digital analog converter: The 4 time oversampling digital filter of a 16-bit L/R independent 2DAC

Frequency response (Fixed, Vriable): 2 Hz - 20 kHz ±0.1 dB (at the time of a 44.1kHz input)

Blance: 20 Hz - 20 kHz ±0.3 dB

Filter: The 3rd Bessel filter

Channel: Two channels

Dynamic range: 96 dB or more

SN ratio: 104 dB (1 kHz)

Channel separation: 100 dB or more (1 kHz)

THD: 0.0015% (1 kHz, THD)

Digital input:

Coaxial: 0.5 Vp-p/75ohms

Optical: Optical-fiber connector

Digital output: Digital-recording output: 0.5 Vp-p/75ohms

Analog output:

A fixture and a balance: 2.5 Vmax/600 ohms (XLR)

A fixture and unbalance: 2.5 Vmax/120 ohms (RCA)

Variable and unbalance: Zero to 2.5 Vmax/120 ohms (RCA)

Headphone output: 0 - 50 mW/eight ohms

Power source: 220/240 V AC, 50/60 Hz

Power consumption: 28 W

Dimensions (W x H x D): 462 x 104 x 368 mm

Weight: 9 kg

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