64 ASUS Xonar DX
Frequency range Response
From 20 Hz to 20 kHz, dB -0.11, +0.01
From 40 Hz to 15 kHz, dB -0.05, +0.01

9. RightMark Audio Analyzer test

Testing chain: External loopback (line-out - line-in)

Sampling mode: 24-bit, 48 kHz

Summary
General performance: Excellent
Frequency response
Frequency response (from 40 Hz to 15 kHz), dB: +0.01, -0.05 Excellent
Noise level, dB (A): -112.7 Excellent
Dynamic range, dB (A): 112.6 Excellent
THD, %: 0.0006 Excellent
IMD + Noise, %: 0.0009 Excellent
Stereo crosstalk, dB: -102.4 Excellent
IMD at 10 kHz, %: 0.0010 Excellent