Chicago measures low-frequency bass at 55 dBC inside neighboring residences after MCC 11-4-1115 was updated to capture sub-bass that travels through walls. C-weighted readings allow inspectors to cite venues whose sound passes A-weighted limits.
MCC 11-4-1115(a) sets a 55 dBC interior limit measured inside the nearest residential unit's living space, in addition to the 55 dBA exterior property-line limit. C-weighting captures low-frequency energy that A-weighted meters miss, addressing complaints from nightclubs, concert venues, and amplified outdoor events whose bass penetrates walls and floors. Inspectors from the Department of Public Health and the Police Department use Type 1 sound meters with octave-band analysis to confirm violations. Repeat offenders face escalating fines and may be ordered to install bass traps, sub-floor isolation, or limit DJ booth output. Liquor licensees risk additional Business Affairs and Consumer Protection enforcement under MCC 4-60-140 nuisance provisions.
First violation $600, escalating up to $10,000 for repeat offenders; persistent venues face liquor license review under MCC 4-60-140 and possible deemed-approved nuisance abatement orders.
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See how Chicago's low-frequency bass limits rules stack up against other locations.
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