Both systems are capable of the same acoustical output, inasmuch as they are both limited by
the power handling capabilities of their identical low-frequency sections. Table 1 indicates the
sustained maximum sound pressure level in the reverberant field which these systems can produce,
based on room volume. Levels for a single unit, as well as for the three units, are given. Median
reverberation times as given in Figure 11 are assumed in these calculations, as are system directivity
index and estimated room surface area.
113
118
800W
ft.)
108
113
800W
ft.)
108
111
800W
cu.
104
800W
ft.)
Table
Maximum
for
JBL
and
Systems in Cinsmas
of various sizes (non-b&m
Taking the information presented in Table
we can now determine the actual power
requirements to produce target levels in the house of 105
per channel:
ft.)
It.)
JBL
(one
300
400W
JBL
(one
al. ft.)
1 Power Requirements for
of 105
in Smaller Houses
mode)
levels, as calculated in
A,
and C, represents the maximum level that would exist at a point
about
two-thirds from the front
of the house to the back.
