So you hear it better, plain and simple. Even if you turn down the volume during breaks, the commercial is louder than it would have been.
Professional editors compensate for fluctuating sound levels in the editing room, whether for dialogue, action, etc.. There are decibel ranges appropriate for each. Commercials (and evidently DVD production houses) ignore this.
Source: I’ve worked as on-set audio engineer and in post-production for TV and movies.
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