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Subwoofer rating
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How this data is calculated
The metric taken into consideration is the True Impulse Peak (TIP). Low Frequency Effects in movies are generally impulses, which are called Dirac-delta in signal processing theory. These are short bursts of all frequencies, basically the sweep measurement signals played very quickly. These effects are generally high-passed on 20/40/50 Hz, depending on the desired maximum volume. Increasing the frequency span decreases the maximum volume, because more frequencies played at the same time mean there's less power for each frequency. When the limiter of the subwoofer is reached, it's usually because DSP amplification of a low extension frequency cannot go any further - the power has ran out. This limiter happens on the entire signal, dragging all other frequencies down, as most of the power is used for making the low end louder. TIP takes this into consideration when scoring how loud can specific band-limited impulses get. Because these effects are what subwoofers are most commonly used for, TIP is a good metric for comparing real-world movie performance.