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About the SDR-4000
The Spectral Audio SDR-4000 is a reference-class CD processor designed for high-end digital playback. The available documentation in the search results identifies the SDR-4000SL and SDR-4000SV variants, with the SV presented as the later limited-edition model and the SL as the earlier model. The SL specifications show a 44.1 kHz sample rate, four custom 24-bit DACs in a double-balanced configuration, HDCD-capable 8x oversampling digital filtering, and a fully discrete passive analog filter. The analog output stage is single-ended RCA with very low measured distortion, high signal-to-noise ratio, and a low-output-impedance design intended for reference audio use. The product is a no-longer-current high-end component from Spectral’s SDR program.
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