Looks can be deceiving. When it was released, this DAC was considered the best you could get under $1500. Perhaps that explains why, to this day, the ADCOM GDA-600 is known as one of the great "sleeper" DAC's. And at this price, don't sleep on this one.
Acquired directly from the original owner.
- Full 30-point service check
- Cleaned controls, switches, and chassis
Input format S/PDIF, AES/EBU
Input type S/PDIF Coax (RCA x 2); S/PDIF Optical (Toslink® x 1); AES/EBU (XLR X 1);
Input isolation Transformer coupled
Input decoding Crystal CS 8412 receiver
Digital output S/PDIF Coax (RCA X 1)
Digital filter Burr-Brown Linear Phase
Resampling rate 8x (352.8kHz for 44.1 kHz input)
DAC type Selected R-2R Burr-Brown PCM-63
Resolution 20 bits
Phase inversion Digital domain (manual selection)
Frequency response + 0, - 0.5 dB (DC - 20kHz)
THD 0.009% (20 Hz - 20kHz, full scale); 0.002% (1 kHz, full scale)
Signal to noise ratio 106dB (20Hz - 20kHz, unweighted); >112 dB (20Hz - 20kHz, "A" wtg.)
Dynamic range 98dB
Channel-to-channel crosstalk 106dB (20Hz-20kHz); 112dB (1kHz)
Output voltage 2.234 V RMS (full scale)
Output impedance 77 ohms
Output type Single ended (RCA x 2)
Output mute Relay activated (Power, Unlock)
Power requirements 97 - 132 VAC, 50/60 Hz; 220-240VAC,50/60Hz
Power consumption (nominal) 15watts at 120VAC
Fuse 3/8 amp, Slow blow
Dimensions 17"W x 3 1/2"H x 10 1/2"D
Shipping weight 12 lbs.
ADCOM GDA-600 Owner's Manual
The GDA-600 Digital to Analog Converter brings you closer to the reality - and to the astonishing potential - of digital sound by controlling the inherent distortions and design compromises evident in most digital sources.
In keeping with a successful "begin with the basics" approach, Adcom's engineers carefully re-thought the power supply used in this exciting new product. Isolated on its own circuit board, it incorporates a bi-directional AC filter, two transformers, seven separate stages and 27 filter capacitors to increase circuit isolation and minimize noise and unwanted interference.
An industry acclaimed Crystal Semiconductor receiver, custom-configured for minimum jitter, forms the front end for conversion circuitry that includes a high speed digital filter and dual selected Burr-Brown 20 bit ladder-type DACs. Each unit's master clock duty cycle is individually computer-calibrated to insure the highest accuracy.
Linear phase anti-imaging filters, 1% metal film resistors and Adcom's proprietary linear gain amplifiers give exceptional analog performance. Again, individual calibration assures minimal DC offset.
The GDA-600's flexibility is assured by four impedance-matched inputs: three S/PDIF inputs (two coaxial, one optical) and an AES/EBU XLR input. A buffered S/PDIF output lets you record entirely in the digital domain.