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Community WET Series II - Operation and Installation Manual - Page 19
SELECTING AMPLIFIERS
Amplifiers are a vital part of the sound system’s performance and should be carefully selected for appropriate
power output. A table is provided below to help you size your amplifier’s power output capability to the
various models in the WET Series II product line.
Typically, it’s good practice to select an amplifier that can provide substantially more power than the
continuous rating of the loudspeaker. This is so that enough reserve power will be available for transient peaks.
More loudspeakers are damaged by under-powering them than by over-powering.
If you know in advance that a particular loudspeaker, or zone of loudspeakers will never be used at, or near
their maximum rated power, then it’s acceptable to select a power amplifier that is equal to, or slightly larger
than the loudspeaker’s power handling specification. We do not recommend operating WET Series II
loudspeakers with an amplifier that does not at least meet the rated power handling of each model.
Model
Rated Power Handling
Recommended Amplifier Power
W2-218
125W RMS / 300W Program
250 - 375 WRMS at 8
Ω
W2-228
250W RMS / 600W Program
500 - 750 WRMS at 4
Ω
W2-2W8
250W RMS / 600W Program
500 - 750 WRMS at 8
Ω
W2-215
200W RMS / 500W Program
400 - 600 WRMS at 8
Ω
W2-312
200W RMS / 500W Program
400 - 600 WRMS at 4
Ω
W2-322L
LF: 400W RMS / 1000W Program
MF/HF: 160W RMS / 400 W
Program
Bi-amped
LF: 800 - 1200 WRMS at 4
Ω
MF/HF: 320 to 640 WRMS at 8
Ω
W2-315
200W RMS / 500W Program
400 – 600 WRMS at 4
Ω
W2-112
200W RMS / 500W Program
400 – 600 WRMS at 8
Ω
W2-122
400W RMS / 1000W Program
800 – 1200 WRMS at 4
Ω
W2-125
400W RMS / 1000W Program
800 – 1200 WRMS at 4
Ω
Note:
“WRMS” = “Watts RMS” = “Watts Root Mean Squared”
Amplifiers for 70V/100V Operation
In past times, nearly all 70V/100V amplifiers were of modest power level and employed step-up transformers to
increase their output voltage to a fixed value of 70V (or 100V) at their maximum operating level. The purpose
of stepping up the output voltage is largely to decrease the wire size needed for a given system, particularly
when long wire runs are unavoidable. A basic rule of Ohm’s Law is that the higher the voltage and the higher
the load impedance, the less effect the cable resistance has on the absorption of power within the cable. A
70V/100V system achieves both of these desirable design goals.
A second important reason for constant voltage systems is that the use of a step-down transformer at each
loudspeaker (or in the case of WET II products… a step-down a
utoformer
) permits the installer to choose among
several power taps at each individual loudspeaker location. This lets the installer adjust each loudspeaker’s
level in relation to the other loudspeakers, even though multiple loudspeakers are driven by the same amplifier
on the same circuit. Without a transformer (or an autoformer), level adjustment could only be accomplished by
adding resistance to one or more loudspeakers. Resistors would in fact reduce the operating level, but would
also consume valuable power from the amplifier, as well as produce unnecessary heat as a byproduct.
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