Required High Pass Filter - Community ENTASYS Application Manual

QUICK START
Table 2: Amplifier Size Reduction for Decreased SPL and Increased Crest Factor
Reduction
of SPL
0
‐3
‐6
‐9
‐12
‐15
‐18
‐21
‐24
‐27
‐30
Using Table 2, locate the SPL reduction value in the column on the left. Any amplifier size in that row can be used. The
heading at the top of that row lists the crest factor of a signal that the amplifier will pass without clipping while still driving
ENTASYS to the desired SPL.
For example, if an EASE (or EASE Focus) model shows that the SPL is 6 dB too high, it can be reduced by employing a smaller
amplifier (e.g., with a 900 W into 4 ohm rating), thereby allowing a signal with only a 6 dB crest factor to yield the desired SPL.
Alternatively, an amplifier rated at 3,600 W into 4 ohms will allow a signal with a 12 dB crest factor to yield the desired SPL.
The use of an external, active high pass filter before the power amplifier(s) driving ENTASYS systems is always required. This
high pass filter will help to protect the woofers from damage due to excessive low frequency excursion. It will also avoid
wasting amplifier power attempting to reproduce frequencies below the loudspeakers' intended operating range. A high pass
filter set to 200 Hz, 24 dB/octave or higher frequency should always be used. Increasing the high pass filter to a higher
frequency or greater slope will not present any problems for an ENTASYS system.
EASE Focus is a line array software modeling program that may be downloaded without cost from
www.easefocus.com/downloads.html. EASE Focus is an extremely helpful tool for determining how many ENTASYS
modules should be used, where they should be placed, and how they should be aimed to quickly obtain the desired
SPL for an audience area.
For more information on EASE Focus see the System Design Guidelines section on Pages 25-26.
For 6 dB
Crest Factor Crest Factor
Amplifier Rating Amplifier Rating
(4 ohm)
3,600
1,800
900
450
225
112
56
28
14
7
4
R EQ U I R E D H I G H PA S S F I LT E R
Community ENTASYS Application Guide - Page 17
For 9 dB For 12 dB
Crest Factor
Amplifier Rating
(4 ohm) (4 ohm)
3,600
1,800 3,600
900 1,800
450 900
225 450
112 225
56 112
28 56
14 28
7 14
For 15 dB
Crest Factor
Amplifier Rating
(4 ohm)
3,600
1,800
900
450
225
113
56
28