Frequency Response: 20Hz to 20kHz +/‑0.2dB.

Dynamic Range: >92 dB 20Hz‑22 kHz.

Distortion (THD+N): <0.005% @1kHz.

Crosstalk: >88dB below full scale.

Sampling Rate: 48kHz (variable from 40.4kHz to 50.8kHz under external control).

Analogue Inputs: Stereo (L/R) Combination XLR/quarter‑inch TRS jacks, balanced/unbalanced.

Analogue Outputs: Stereo (L/R) XLR, Stereo quarter‑inch jacks, balanced/unbalanced.

Digital Conversion: 20‑bit 256 times oversampling A‑D; 20‑bit, 256 times oversampling D‑A.

Digital Input/Output: ADAT Multi‑channel Optical Digital Interface, S/PDIF Digital Interface, BNC jack for 48kHz word clock connection.

Factory Preset Programs (ROM): 100.

User Programs (RAM): 200.

Dimensions (WxHxD): 19 x 1.75 x 7 (inches). (483mm x 45mm x 178mm).

The 120 page manual is online here:

http://quadraverb.nl/images/q20-ref.pdf