Onkyo C-724AX (2001)
The Onkyo C-724AX is an early-2000s CD player that launched in Japan on July 11, 2001, at ¥31,000. Documentation is thin. No period reviews have surfaced in the archive's research. The Japanese specification record that exists does show what Onkyo cared about.
Onkyo's stated focus for the C-724AX was ground stability. The company's design notes explain the problem. When digital signals, servo current, or clock signals bleed into the ground of an analog circuit, the reference potential fluctuates and sound quality suffers. The C-724AX was developed with a circuit configuration and PCB pattern repeatedly verified through theoretical analysis and listening tests, intended to keep the ground potential stable even with digital signals present. The D/A converter is a delta-sigma type linear single-bit design, chosen for its ability to reproduce minute audio signals. The crystal oscillator that clocks the converter is small, vibration-resistant, and firmly fixed for a stable clock signal.
Feature-wise, it's a capable but straightforward player of its era. It has two optical digital outputs and a fixed analog output at 2.0 Vrms. Functions include next selection, peak search, time edit, and memory/memory reverse. A wireless remote was included. Measured specs are respectable: frequency response of 5 Hz to 20 kHz, total harmonic distortion no more than 0.005%, dynamic range of 96 dB or better, signal-to-noise ratio of 90 dB or more, and channel separation of 85 dB or better. It draws 8W and measures 435 × 91 × 314 mm at 4.0 kg.
The record doesn't say how it was received. There are no reviews, no owner impressions, and no market context. The archive has found no service manual reference for the C-724AX, and no source for the specifications beyond the Japanese spec sheet. It surfaces occasionally in used listings, including a YouTube video title pairing it with a Pioneer SA-910 amplifier. No production end date or collector pricing is documented. If you own one or have paperwork for it, the archive would welcome the documentation.
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