40 Hz reduced spacing
The above shows what happens at 40Hz if we reduce the spacing between the
subwoofers to 4.3m.
We get better central coverage without 40Hz side lobes - adequate for long, narrow
“shoe-box” venues but wider coverage would be required for most arenas.
40Hz close coupled
Close coupling would give a wider coverage at that frequency but the spacing could
still give coverage irregularities at mid-bass frequencies due to the shorter
wavelengths at higher frequencies.
The real world
Bass notes usually include harmonic components each with a different wavelength.
Some will add giving an amplitude peak whilst others will subtract giving an
amplitude dip. This will give tonal changes with listening position and emphasise
particular notes and timbres.
All material © 2007. Martin Audio Ltd. Subject to change without notice.
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