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+Sound Experiments
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+===
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+
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+The Driver Interface Units (DIUs) and Passenger Interface Units (PIUs)
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+on the buses need to be audible to drivers and passengers when accepting
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+or rejecting passes.
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+
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+This document collects some data about the ambient noise, the sound level
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+of the legacy system and experiments with the replacement system.
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+
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+| System Type | Typical dB | Button dB | Accept dB | Reject dB |
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+|-------------|------------|-----------|-----------|-----------|
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+| Ambient on Bus | 70-80 | | | |
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+| Legacy System | 95 | 97 | 95 | 95 |
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+| v Acorn Squash | 80 | 74 | 82 | 82 |
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+| v Alfalfa Sprout | 85 | 89 | 90 | 80 |
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