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To begin at the conclusion: the Adcom GCD-575 is a breakthrough. It's a CD player that offers high-end qualities at a mass-market price. A $5000 product that advances the state of the art is nice, but when a $600 product outperforms last year's multi-thousand-dollar player—that, friends, is news worth repeating.

In the past I have not paid much attention to the sonic differences among CD players. The differences in sound quality among recordings (due to miking, EQ, and mixing practices) were so great that player…

We have started to include in Stereophile's reviews of digital products the 1/3-octave analyzed spectrum of a player's output while it reproduces the dithered –90.31dB tone from the CBS CD-1 test CD. With an undithered signal, a tone at this level only crosses three quantizing levels and therefore is not sufficiently described for it to be reproduced as a sinewave. However, as the code representing this tone on track 19 on the CBS disc has had an appropriate amount of dither noise added when the CD was cut, it should reproduce as a pure, if noisy, sinewave. Any…

Description: Solid-state CD player with remote control, TDA1541A D/A converter, KSS212B CD mechanism, and coaxial digital output. Frequency range: 5Hz–20kHz. Dynamic range: 98dB. Signal/Noise Ratio: 105dB. Channel separation: 95dB. Total harmonic distortion: 0.0025%. Line output: 2.5V.
Dimensions: 17" (430mm) W by 3" (76mm) H by 10.25" (260mm) D. Weight: 12 lbs (5.5kg).
Price: $599 (1989); no longer available (2014). Approximate number of dealers: 320 (1989).
Manufacturer: Adcom, East Brunswick, NJ 08816 (1989); Adcom, LLC, PO Box 2668, Sedona, AZ…

With small speakers, the first and most important consideration is what stands to use. Often treated as an afterthought, a good pair of stands is fundamental to getting optimum performance from even inexpensive loudspeakers. With my listening chairs placing my ears 36" from the ground, 24"-high stands were appropriate to use with the Celestions, so I used a $300 pair of Celestion SLSi models which were handy (footnote 1). These are single-pillar designs, with steel top and bottom plates. I filled the extruded-aluminum pillar of each with 25 lbs of lead shot,…

The Celestion 3's impedance phase (dotted line) and magnitude (solid line) are shown in fig.1. [Note that the phase scale is the opposite way around from what the magazine adopted in 1991, with negative (capacitive) angles at the top.—Ed.] The peak in the bass due to the woofer's sealed-box loading reaches a maximum of 46 ohms at 72Hz. Overall, putting its low sensitivity to one side, the 3 will be easy to drive, the impedance only dropping below 8 ohms in the upper bass and mid-treble. The slight wrinkle seen at 250Hz is probably a cabinet effect, the cabinet…

Description: Two-way, shelf- or stand-mounted loudspeaker. Drive-units: 1" titanium-dome tweeter, 5" pulp-cone woofer. Low-frequency alignment: sealed-box. Crossover frequency: 5kHz. Crossover: high-pass slope, second-order, 12dB/octave; low-pass slope, first-order, 6dB/octave. Frequency response: 75Hz–20kHz –3dB. Sensitivity: 86dB/W/m. Nominal impedance: 8 ohms. Amplifier requirements: 10–60W continuous. Maximum power handling: 60W program.
Dimensions: 13" (310mm) H by 7.3" (185mm) W by 8.5" (215mm) D. Recommended stand height: 24". Internal volume: 8…

According to the company:

Michael Lavorgna kicks off his “Audio Streams” column with a listen to Bluesound’s WiFi…