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Spectral SDR-4000

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The original SDR-4000 Reference CD Processor, introduced in 2005, established a new performance benchmark in high-end digital playback. Employs four custom 24-bit DACs in double balanced configuration, an 8x oversampling 56-bit digital filter, VRDS disc clamping, and Spectral's discrete balanced analog output circuitry. The SDR-4000 was the first in a series of progressively refined versions culminating in the SDR-4000SV.

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US Audio Mart

Spectral SDR4000s CD Player US Audio Mart $4,200 Nov 4, 2025

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Model Variants of Spectral SDR-4000

1. Spectral
2. CD player

SDR-4000 Pro

1. Spectral
2. CD player

SDR-4000SL

1. Spectral
2. CD player

SDR-4000SV