Integra DX-530
Onkyo's fiber-optic answer to digital harshness. A compact disc player that treats the analog output stage as the real battleground.
Overview
The DX-530 came out as part of Onkyo's Integra series of compact disc players. Its pitch was unusual for the period. Onkyo argued that the problem with early CD sound wasn't the digital-to-analog conversion itself, but what happened afterward. The company's line was that digital signal interference leaked into the analog domain and produced the harshness and stridency many listeners complained about. The fix, according to Onkyo's own advertising, was Opto-Coupling - using fiber optics rather than conventional printed circuit wiring to carry the signal between stages. Audio (January 1988, p.31) ran the campaign copy describing the DX-530 as the newest Onkyo player to incorporate the technology. It claimed the player "ensures correct D/A conversion" and delivers "superb CD sound at an affordable price." That last phrase is marketing, not a measured verdict. It does show what the player was meant to be: a serious disc spinner without flagship pricing.
The converter diverges from the usual recipe. Onkyo built what it called a ladder-network Integra Linear Converter for the DX-530. The interesting decision was dropping the quartz oscillator from the analog block. The company reasoned that a conventional integrated D/A system needs an oscillator that can inject pulse noise, so the ladder converter was developed to work with Onkyo's serial optical transmission scheme without one. Whether anyone could hear the absence of that noise source is a fair question. The engineering logic is at least specific.
The disc drive got similar attention. Onkyo's IFS (Isolated Floating Suspension) system separates the drive section from the chassis and floats it on springs plus four rings of vibration-absorbing material. The top cover, the largest surface on the unit, is damped with a layer of mica particles, bitumen and resin meant to convert vibration into heat. The underside of the analog board carries an insulation packet containing zirconia particles and electromagnetic damping material, which Onkyo claims absorbs stray flux from the components above it. Collectors who have opened these players note the damping layers are the first thing to degrade with age and heat. A unit that has lived in a hot rack may no longer be doing what the brochure promised.
The published figures are respectable for its class. Frequency response is quoted at 2 - 20,000 Hz, wider at the bottom than the DX-330 and DX-230 in the same Integra line, which were specified from 5 Hz. Harmonic distortion is 0.003% at 1 kHz, a full order of magnitude better than the DX-230's 0.03%. Dynamic range is 93 dB and signal-to-noise ratio 96 dB, with channel separation of 90 dB at 1 kHz. Wow and flutter is listed as below the threshold of measurability, which is the honest way of saying the quartz-locked servo does its job. Output level is a standard 2 volts r.m.s. The D/A conversion is 16-bit with two-times oversampling at an 88.2 kHz sampling frequency, and error correction uses cross-interleave Reed-Solomon coding. Reading rotation runs about 500 down to 200 r.p.m. under constant linear velocity, with linear velocity between 1.2 and 1.4 m/s.
The DX-530 is a full-width component at 435 × 92 × 364 mm (17-1/8" × 3-5/8" × 14-5/16"). It weighs 5.6 kg / 12.3 lbs, heavier than its DX-330 and DX-230 siblings at 4.8 kg, which fits the extra damping and the more elaborate converter board. Power supply options covered the usual export spread: AC 120V 60Hz, AC 220V 50Hz, AC 240V 50Hz, and a switchable 110/120/220/240V 50/60Hz version. Units turn up secondhand in several voltages, so check the rear panel before buying.
The feature set is where the DX-530 separates itself from the cheaper Integras. The headline is Onkyo's Random Music Calendar, a display that shows programmed tracks in their actual playback order rather than as a static list of memorized numbers. It can show up to 19 track numbers at once, and as each track finishes it vanishes and the rest shift up a notch. The calendar works in normal play, memory play, and random (shuffle) memory play. The display also shows the track in play, index number, sequential memory position, and elapsed or remaining time for both the current track and the disc or memory sequence. A 40-key wireless infrared remote duplicates every control function, including a motorized analog output level. That adjusts volume at the player, which few period remotes did without a preamp with remote capability.
As with any 1980s CD player, the concerns for a buyer today are the transport and the laser. The DX-530's optical non-contact readout system is sound in principle, but the suspension springs and damping rings Onkyo made so much of are now decades old, and the drawer mechanism and belt are the usual wear points. The Random Music Calendar display and the remote are the two features most likely to be missing or dead on a survivor. Remotes get lost, and the display driver is not a part anyone stocks. Test every function before paying collector money for one.
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