Apple firmware capped
Apple firmware uncapped
iPodLinux

RightMark Audio Analyzer test


Testing chain: External loopback (h/p-out - line-in)
Sampling mode: 16-bit, 44 kHz

iPod 4G Firmware Comparison




Summary

TestApple firmware cappedApple firmware uncappediPodLinux
Frequency response (from 40 Hz to 15 kHz), dB: +0.02, -0.10+0.02, -0.11+0.02, -0.08
Noise level, dB (A): -105.8-104.2-103.8
Dynamic range, dB (A): 86.589.789.0
THD, %: 0.00950.00760.0075
IMD + Noise, %: 0.0150.0110.011
Stereo crosstalk, dB: -104.9-101.2-97.8



Frequency response

Spectrum graph


Noise level

Spectrum graph


Dynamic range

Spectrum graph


THD + Noise (at -3 dB FS)

Spectrum graph


Intermodulation distortion

Spectrum graph


Stereo crosstalk

Spectrum graph



This report was generated by RightMark Audio Analyzer 5.5