After examining the metadata from TestNav's files, This sound actually comes from SoundJay.com and is actually available uncompressed.
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Credit: Bell Ringing 04 From SoundJay.com
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Note: Unlike many videos of this audio from TestNav, the audio source is actually lossless!
WAV (uncompressed) → AVI (still uncompressed) → MKV (FLAC - Lossless), and finally YouTube (Opus Audio - Lossy, but Transparent at 251 kb/s)

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