Low-Frequency Bass Limits: Los Angeles vs South San Gabriel
How do low-frequency bass limits rules compare between Los Angeles, CA and South San Gabriel, CA?
Los Angeles and South San Gabriel have similar restriction levels.
Los Angeles, CA
Los Angeles County
LAMC §111.03 sets dB(C) bass limits at the property line in addition to dB(A) ambient thresholds, targeting subwoofer and amplified sub-bass below 125 Hz. Exceeding either A-weighted or C-weighted limit qualifies as a noise violation.
View full Los Angeles rules →South San Gabriel, CA
Los Angeles County
LA County Code Title 12.08 measures low-frequency bass from sound systems on the C-weighted scale, capping levels at 60 dB(C) inside neighboring residences in unincorporated areas. LASD investigates throbbing-bass complaints from clubs, parties, and modified vehicles.
View full South San Gabriel rules →Key Facts Comparison
| Fact | Los Angeles | South San Gabriel |
|---|---|---|
| Governing section | LAMC §111.03 | - |
| Bass measurement | dB(C) weighting | - |
| Bass frequency range | Below 125 Hz | - |
| Measurement location | Receiving property line | - |
| First-offense fine | $250 administrative citation | - |
| Measurement scale | - | C-weighted (dB(C)) |
| Night cap | - | 60 dB(C) inside residence |
| Day cap | - | 65 dB(C) inside residence |
| Authority | - | LA County Code §12.08.350 |
| Common sources | - | Clubs, parties, modified stereos |
Highlighted rows indicate differences between cities.
Los Angeles FAQ
Why does LA measure bass separately?
A-weighting de-emphasizes low frequencies that humans still feel through walls and floors. C-weighting captures sub-bass that disturbs neighbors even when overall dB(A) reads as quiet.
What sets off a dB(C) violation?
Subwoofers, club bass cabinets, car audio, and home-theater systems pushing sustained energy below 125 Hz across property lines beyond the §111.03 presumed limit.
Who measures it?
LAPD Noise Enforcement Team or LASAN investigators with calibrated Type 2 sound level meters supporting both dB(A) and dB(C) weighting modes.
South San Gabriel FAQ
Why use C-weighting instead of A?
A-weighting filters out low frequencies similar to human hearing at moderate levels. C-weighting captures bass energy that travels through walls and disturbs sleep, which A-readings often miss. The county uses C-weighting for chronic bass complaints.
Can deputies measure inside my home?
Yes with the resident's consent. LASD acoustic-trained deputies bring calibrated meters and document interior dB(C) levels per the county procedure. Refusal of access can complicate enforcement against the source.
What about subwoofers in lifted trucks?
Modified-vehicle bass is enforced under California Vehicle Code §27007 (audible at 50 feet) plus county nuisance rules. CHP and LASD issue infraction citations starting at $238, with equipment-impound options for repeat offenders.
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