Electro-Voice 2.1P - Manual (Page 11)

Electro-Voice ® EVID 12.1P User Manual 9
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Higher-level foreground music in bass heavy applications such
as dance floors, amusement arcades, or loud bars: use one pair
of EVID™ 6.2’s for each 12.1P.
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For example, a large hotel might use eight 3.2’s and two 12.1P’s
in the dining room, eight 4.2’s and two 12.1P’s in the lounge, four
6.2’s with two 12.1P’s surrounding the dance floor, 6.2’s around
the pool, 6.2’s or 4.2s with or without 12.1P’s in the lobby, and
3.2’s in the corridors.
Characteristics of All Subwoofers
While subwoofers do radiate sound omni-directionally (in all directions)
and the sound is generally non-localizable (one can’t hear exactly where
it comes from), subwoofer sound level still drops off the farther one
moves from the subwoofer. The highest output and best room loading
are accomplished with the subwoofer mounted in a corner at a three-
boundary junction (wall/wall/ceiling or wall/wall/floor, an arrangement
also referred to as 1/8 space). Mounting at a two-boundary junction (wall/
ceiling, or 1/4 space) produces three dB less output, and mounting in the
middle of a room in the ceiling (1/2 space) reduces output still another
three dB.
Subwoofers produce large amounts of long wavelength low-frequency
energy. Every object has its own resonant frequency, and long
wavelengths tend to excite large objects (like walls, floors, doors and
ceiling panels). Anything loose in or on a ceiling or wall will buzz or rattle
as a subwoofer’s level is increased. Most of these can be isolated and
fixed with small, strategically placed bits of foam tape. Others may
require driving additional nails or screws and perhaps some caulking to
dampen their sympathetic movement.