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

ADCOM GCD-575 (1988)

Adcom GDC-575 CD player has been worth waiting for. Now there's a CD player with analog audio circuits as technically advanced as its digital stages. Since the human ear can only appreciate musical sounds in their analog format, Adcom began with the objective of producing the first affordable CD player whose direct-coupled audio output would deliver the long anticipated technical benefits of digital sound.

Designers and engineers usually use Class "A" audio circuits where price is no object. In its purest form, Class "A" offers a highly sophisticated level of audio amplification, often demanded by those who can distinguish outstanding sonic performance from the merely average. Adcom's GCD-575 employs a no-compromise, Class "A" analog audio amplifier section which provides superior resolution by more clearly defining low-level information. This higher resolution makes an audibly dramatic difference in the musicality of CD reproduction. To achieve this result, the analog audio circuits in the GCD-575 were based on the same proprietary high speed linear amplifiers used in Adcom's GFP-555 pre-amplifier, universally recognized for its outstanding musical integrity.

Importantly, Adcom's CD player is designed with a low output impedance (100 ohms) so that it can operate up to its maximum capability with a wide variety of associated equipment. It is not only compatible with virtually all input stages of amplifiers, preamplifiers, tuner/preamplifiers, etc. , but also permits the use of longer interconnecting audio cables, when required, with minimal signal deterioration.

Additionally the GCD-575 is supplied with a high quality, low-loss audio cable to prevent the sonic smear that conventional audio cables tend to cause. The use of this special cable and the 100 ohm output impedance permits the GCD-575 to be used with Adcom's SLC-505 passive straight line controller. If no other source equipment will be used, the variable output can be used directly into your power amplifier, bypassing the preamplifier circuits normally required by other CD players.

A muli-winding power transformer, connected to three separate tightly regulated power supplies for the audio, digital and display circuitry, insures isolation of the different functions and optimal operation of each without interference.

The four special heavy feet installed on the GCD-575 are reversible metal castings. On one side, the flat surface insures a wide contact area. The revers side is cast with buil-in "Iso-points" which, when used in a three-foot configuration, operates as a "tripod" support system.

A special polarity-inverting switch permits you to reverse the normal positive polarity to negative (inverted) polarity. This corrects playback of CDs in which the polarity was incorrectly recorded (inverted), or for use in systems in which one of the components causes a reversal of correct polarity


Frequency response: 5 - 20,000 Hz +0,1; -0,5 dB

Signal-to-noise ratio: 105 dB

Dynamic range: 98 dB

THD: 0,0025%

IMD (70 Hz difference): 0,00018% at 5 kHz

Channel separation (1kHz): 95 dB

Interchannel Phase Shift: less than 1,8 ° at 20 kHz

Output impedance:

Fixed: 100Ω

Variable: 100Ω

Digital: 75Ω

Output level:

Fixed: 2,5 V RMS

Variable: greater than 4,5 V RMS

Digital: 0,5 V peak-to-peak

Laser: GaAIAs semiconductor

Sampling rate: 176,4 kHz

Quantized bits: 16-bit linear

Power: 120 V AC, 60 Hz (available in 220/240, 50 Hz)

Dimensions (W x H x D): 430 x 87 x 285 mm (17" x 3-7/16" x 11-1/4")

Weight: 5,5 kg (12 lbs)

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