Indianapolis uses a plainly-audible standard combined with a 115 dB amplifier cap under Rev. Code Ch. 391, Article III rather than zone-based dBA limits.
Sec. 391-302 makes it unlawful to create any unreasonable noise, defined as sound of a volume, frequency, or pattern that disrupts the comfort or repose of reasonable persons. The code specifically caps amplified speakers and instruments at 115 dB measured six inches from the speaker. For most everyday complaints (parties, vehicles, equipment), enforcement turns on whether the sound is plainly audible from a neighboring property or 50 feet on the public right-of-way, rather than a measured dBA limit at the lot line.
Second violation in 12 months: $250 minimum fine. Third or later: $500 minimum fine (Sec. 391-119).
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