April 21, 2021 § Leave a comment

If there is one room boundary that can be counted on to always be at the same relative position to any speaker, it is the floor. We call the reflection from the floor that occurs about halfway between the speaker and listener “the floor bounce”. Since it is delayed in time from the direct sound, it causes a comb-filter effect. The fundamental (starting) frequency varies depending on speaker driver height, ear height, and listener distance. The closer to the speaker, the lower in frequency is the floor bounce fundamental. When we measure a 41”-high midrange driver at 1-meter, we see a cancelation at 160Hz. At 2-meters, the dip moves up to 230Hz. At 3-meters, it occurs at 300Hz, as shown in Figure 20 above (blue curve for the midrange driver). In the raw response (i.e. before crossover filters) the midrange showed a 15dB deep dip one octave wide! There is also a floor bounce from the woofer itself, but since the woofer is so close to the floor, it occurs above 1kHz.

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