ADCOM's new GCD-750 single disc CD player was developed to satisfy the needs of music lovers and audiophiles who want nothing less than the best in audio CD performance and the newest decoding technologies of HDCD.
The GCD-750 starts with digital processing circuitry first developed for ADCOM's widely praised GDA-600 and GDA-700 stand alone D/A converters. The acclaimed Pacific Microsonics PMD-100 over sampling digital filer/HDCD decoder then processes the digital data. After over sampling and high-speed processing, the data stream feeds two differential pairs of 20-bit liner Burr-Brown D/A converters. This ensures full replication of even the most subtle musical nuance. The resulting analog signal, in turn, feeds a discrete high current differential output stage implemented with MOSFET transistors, long recognized in audiophile circles for their unique combination of dynamic punch and tube-like smoothness.
In common with all ADCOM products, the GCD-750's power supply is substantial. In this "dual mono" implementation, two separate transformers provide operating voltages for the unit's various stages through separate secondary windings. A full complement of high current regulators and over sized storage capacitors ensures proper operating voltages to all circuitry stages.
The GCD-750's disc transport is a rugged, high mass, three beam design optimized for superior vibration resistance. The chassis, along with the heavy gauge extruded aluminum face panel, are carefully executed to provide additional stability, mechanical isolation, and damping. The resulting platform is exceptionally resistant to the deleterious effects of spurious resonance's.
The GCD-750 features both balanced (XLR) and single ended (RCA) outputs to complement the input capabilities of any system control center. Future utility is guaranteed by a supplementary coaxial digital input designed to allow owners of auxiliary digital sources (DSS receivers, Laser Disc players, or DVD transports with digital outputs) to enjoy the same exceptional sound quality with appropriate music programming. Convenience features include full remote control, custom programming, repeat modes, random play capability, and a clear calendar display of all disc cuts.
The GCD-750 combines everything we've learned about linear 20-bit D/A conversion and analog circuitry design with a rock sold CD transport. In addition to the audible advantages inherent in a properly executed "single box" player, the GCD-750 brings truly convenient operation and easy access to individual musical selections. The over specified power supply and MOSFET analog circuitry delivers stunningly dimensional sound from any properly recorded compact disc and the HDCD decoding circuitry provides accurate reproduction of all HDCD encoded CDs.
Audition a GCD-750 today. Your ears will thank you.
The design of the GCD-700 multi-disc CD player combines ADCOM's legendary engineering expertise with the newest analog and digital technologies available today.
Our entire audio circuit operates in pure Class "A" and employs ADCOM's proprietary operational amplifiers. This Class "A" design ensures the lowest levels of noise and distortion by avoiding the continuous turn-on- and turn-off sequences of the audio circuit transistors.
Our power supply in the GCD-700 starts with two transformers, one for the analog stages and one for the digital circuitry. Each is mounted on a separate circuit board assembly. By effectively isolating the two basic units that make up a CD player, we prevent the sonic pollutants of pulse noise, radio frequency radiation (RF) and electromagnetic induction (EMI) created in the digital circuitry from contaminating the audio signal in the analog stages.
The most prominent new technology used in the ADCOM GCD-700 is the latest Burr-Brown 20-bit D/A converter. The DACs were chosen for their superior ability to recreate low level amplitude differences. This important, and not so subtle, conversion linearity is the key to the improved resolution of the sonic details in the audio signal. And the 20-bit, 8 times over sampling design ensures complete accuracy in reconstructing today's 16 bit data encoded software.
The GCD-700 also features two sets of gold-plated RCA coaxial outputs, one fixed and one variable, to maximize flexibility. The gain of the variable output along with the programming and all control features, including digital polarity selection, are fully accessible via the infrared remote control. A gold-plated coaxial digital output is supplied for those choosing to use an outboard digital-to-analog converter, such as the ADCOM GDA-700. And, naturally, because all ADCOM products are constructed to outlive as well as outperform the competition, the face panel is anodized, heavy gauge, extruded aluminum to enhance structure as well as appearance.
The GCD-700 exemplifies ADCOM's approach to audio engineering: high performance and high value. It's pure ADCOM.