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| Specification | Required Standard | Why It Matters | | :--- | :--- | :--- | | | 320 kbps CBR (Constant) | Lower bitrates (128/192) lose high-frequency details (cymbals, hi-hats). | | Sample Rate | 44.1 kHz | Standard for CDJs and club mixers. | | Duration | 6:30 – 8:00 minutes | Indicates proper extended intro/outro (typically 30-60 seconds of drums only). | | Dynamic Range | > 10 dB RMS | "Momentum" requires dynamic punch; over-compressed "brickwalled" files fail this. | | Spectral Frequency | Flat up to 20 kHz | A "Verified" MP3 will show a clean cut at 20kHz in a spectral analyzer (e.g., Spek). |