Electrovoice 205-4t 参考指南
greater the overlap, the more uniform the coverage — and the higher the cost. Budgetary
constraints tend to favor sacrificing density, so the optimum center-to-center
configuration is, in practice, the least common of the three. The illustration below shows
these various layout patterns.
constraints tend to favor sacrificing density, so the optimum center-to-center
configuration is, in practice, the least common of the three. The illustration below shows
these various layout patterns.
Ceiling Systems – Size
vs. Coverage
vs. Coverage
In the past system designers
usually specified 8-inch cone
loudspeakers for distributed
overhead systems, at least in
part because they represented
the traditional choice. The
EVID systems however allow
for far more flexible options.
In many cases, you can achieve
usually specified 8-inch cone
loudspeakers for distributed
overhead systems, at least in
part because they represented
the traditional choice. The
EVID systems however allow
for far more flexible options.
In many cases, you can achieve
excellent results — at a significant savings — by using 4-inch elements. This is true in
jobs that do not require extended low-end response or high SPL levels. 4-inch elements
such as used in the EVID the C4.2 offer wider dispersion to allow for fewer speakers to
be employed in the job.
For example, due to its smaller cone diameter, the C4.2 exhibits significantly wider
dispersion (130 degrees) than the C8.2 (110 degrees) at the -6 dB points.
The effect of this characteristic on an overhead system is indicated in the illustration
below. In replacement applications where existing speaker positions are used, the C4.2
(shown in angle “A”) offers greater overlap and, thus, more uniform coverage than an
older conventional 8-inch unit (shown in angle “B”. When specifying a new system, you
can take advantage of the C4.2’s wider dispersion to decrease the number of speakers
jobs that do not require extended low-end response or high SPL levels. 4-inch elements
such as used in the EVID the C4.2 offer wider dispersion to allow for fewer speakers to
be employed in the job.
For example, due to its smaller cone diameter, the C4.2 exhibits significantly wider
dispersion (130 degrees) than the C8.2 (110 degrees) at the -6 dB points.
The effect of this characteristic on an overhead system is indicated in the illustration
below. In replacement applications where existing speaker positions are used, the C4.2
(shown in angle “A”) offers greater overlap and, thus, more uniform coverage than an
older conventional 8-inch unit (shown in angle “B”. When specifying a new system, you
can take advantage of the C4.2’s wider dispersion to decrease the number of speakers
required to cover a given area.
This will result in even greater
savings.
Of course, the C4.2 is
somewhat less sensitive than
the 8-inch C8.2. The
difference is –7 dB. The C4.2
will also have slightly reduced
low-frequency capabilities
below 90 Hz.
Neither of these factors is a
This will result in even greater
savings.
Of course, the C4.2 is
somewhat less sensitive than
the 8-inch C8.2. The
difference is –7 dB. The C4.2
will also have slightly reduced
low-frequency capabilities
below 90 Hz.
Neither of these factors is a
significant problem in many distributed systems, however. The C4.2 is conservatively
rated to handle 50 watts of continuous power equal to or greater than most other brands
of 8-inch units so its continuous SPL output will be more than adequate. Moreover, its
reduced output below 90 Hz can easily be overcome with the addition of the C10.1
subwoofer. For these reasons, the C4.2 represents a great way for you to maintain good
rated to handle 50 watts of continuous power equal to or greater than most other brands
of 8-inch units so its continuous SPL output will be more than adequate. Moreover, its
reduced output below 90 Hz can easily be overcome with the addition of the C10.1
subwoofer. For these reasons, the C4.2 represents a great way for you to maintain good