Digital Processor Reviews

Adcom GDA-700 D/A processor Specifications

Sidebar 3: Specifications

Description: Digital/analog converter with multi-bit DACs. Inputs: two S/PDIF on RCA jacks, one AES/EBU, one TosLink. Outputs: one S/PDIF on RCA jack, one pair analog outputs on RCA jacks. Frequency response: 20Hz–20kHz, +0, –0.5dB. THD: <0.009%, 20Hz–20kHz, full-scale. S/N ratio: 106db (20–20kHz, unweighted), 112dB (A-weighted). Dynamic range: 98dB. Crosstalk: –106db (20Hz–20kHz). Linearity: >1dB at –100dB. Filtering: Pacific Microsonics PMD100 oversampling with HDCD decoding. Analog output voltage: 2.234V RMS at full scale. Power consumption: 25W.
Dimensions: 17" W by 10.5" D by 3" H. Weight: 10 lbs.
Serial number of unit reviewed: 504437571.
Price: $1000. Approximate number of dealers: 350. Warranty: 2 years parts & labor.
Manufacturer: Adcom, East Brunswick, NJ 08816 (1995); Adcom, LLC, PO Box 2668, Sedona, AZ 86339. Tel: (602) 773-1909. Fax: (928) 239-9378. Web: www.adcom.com (2015).

COMPANY INFO
Adcom
PO Box 2668
Sedona, AZ 86339
(602) 773-1909
www.adcom.com
ARTICLE CONTENTS

COMMENTS
tonykaz's picture
Submitted by tonykaz on August 14, 2015 - 1:37pm

Ok, its an Adcom.

Bob Katz just revealed ( in his Innerfidelity Article ) how DACs are becoming "transparent".

His most recent DAC is even more transparent that his previous DAC, which he seemed to think of as perfectly transparent.

However, it seems to require a superb STAX headphone system ( acting as an Audio Microscope ) for even professional Sound people to hear these differences.

The important word of wisdom here: "transparent".

So, that's the quality we should be considering in DACs : they should be "clear windows".

Of course a person would need to know what the music "should" sound like. How is anyone supposed to be able to know this??

Tony in Michigan

Dakmart's picture
Submitted by Dakmart on August 14, 2015 - 4:23pm

... Isn't HDCD actually owned by Microsoft these days?

John Atkinson's picture
Submitted by John Atkinson on August 15, 2015 - 4:32am
Dakmart wrote:
Isn't HDCD actually owned by Microsoft these days?

Yes it is, since 2000, but they don't appear to have done anything substantive with it. See en.wikipedia.org/wiki/High_Definition_Compatible_Digital.

John Atkinson
Editor, Stereophile

JRT's picture
Submitted by JRT on August 15, 2015 - 4:51pm

This article about the old Adcom GDA-700 mentioned that it used Pacific Microsonics' PMD100. That PMD100 was a flawed design that audibly colored the sound. The design flaws were later corrected in the PMD200.

The PMD200 was Pacific Microsonics code running on an off the shelf DSP, and was not backward compatible with the flawed PMD100 which was a device specially manufactured for Pacific Microsonics.

Regardless any of that, for better HDCD playback than you will get from a device using the PMD100, dBpoweramp can be used to transcode HDCD data to 24_bit, 44.1_ksps PCM digital audio, and can convert that to suitable FLAC. You can play that back from a variety of devices and software through a modern DA converter without need for the now obsolete Pacific Microsonics DSP.

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