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ACX Technical Requirements
MP3 Format
192 kbps or higher, Constant Bit Rate (CBR)
44.1 kHz Sample Rate
CD quality audio sample rate
RMS: -23dB to -18dB
Average loudness (typically -20dB)
Peak: ≤ -3dB
Maximum loudness level
Analyze audiobook files for ACX technical requirements compliance
MP3 Format
192 kbps or higher, Constant Bit Rate (CBR)
44.1 kHz Sample Rate
CD quality audio sample rate
RMS: -23dB to -18dB
Average loudness (typically -20dB)
Peak: ≤ -3dB
Maximum loudness level