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Low Frequency Sound from Bass type of Sound
Any source of sound in which the bass is measurably higher than the treble; the C-weighted sound level is more than 8 dB higher than the A-Weighted sound level.
Therefore dB-C sound measurement method should be used when enforcing the dB level that the City of London has set for night time entertainment.
62 dB-C = 70 dB-A
(An 8 dB's difference sounds two times louder when it comes to sound)
Low Frequency Sounds (Bass) are measured in dB-C scale.
High Frequency Sounds (Treble) are measured in dB-A scale.
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