The ASA has rules that differences in volume levels between advertising & programme material should not be excessive (BCAP rule 4.7).
"Advertisements must not be excessively noisy or strident. The maximum subjective loudness of advertisements must be consistent and in line with the maximum subjective loudness of programmes and junction material.
Broadcasters must endeavour to minimise the annoyance that perceived imbalances could cause, with the aim that the audience need not adjust the volume of their television sets during programme breaks. However, BCAP recognises that commercial breaks sometimes occur during especially quiet parts of a programme, with the result that advertisements at normally acceptable levels seem loud in comparison".
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