Specifications

19
AC current consumption
A major objective in the design of the CX Series amplifiers—even the higher-powered models—is to permit
their operation from readily available, standard AC power sources. Actual current consumption will depend on
the amp model, the power level it is operating at, and the load impedances.
“Normal conditions” in power amplifier ratings means operating with a random program source (pink noise), at
an average power level equal to one-eighth of maximum power. This is recognized by most of the world’s safety
agencies as approximating the loudest level you can play music through an amplifier and still keep the incidence
of clipping to a reasonable and inaudible minimum. An amplifier’s peak current draw at full output power into
2 ohms is several times what the “normal” draw is, but its various protection circuits will prevent this condition
from lasting more than a minute or two.
When you plan the AC power hookups for your amplifiers, use this table to predict the current requirements per
amplifier. You can use the one-eighth power figures to predict the normal continuous current draw, then add
a safety margin to allow for occasional crescendos.
POWER CONSUMPTION NOTES
• “Idle” represents amplifier operation with signal levels 40 dB below full
power or lower. Power consumption in standby mode is less than 5 watts.
• 1/8 power with pink noise represents typical program with occasional
clipping, or the approximate highest output level before clipping becomes
audible. Use this rating for most operation.
• 1/3 power with pink noise represents severe program with heavy clipping.
This is an absolute worst case scenario, and approximates music played at
absolute maximum level just short of total obliteration by clipping. This might
be encountered in dance clubs and other scenarios where impact is more
important than fidelity of sound. To avoid overheating, do not use load
impedances lower than 4 ohms per channel (non-”V” models) or lines loaded
at higher than 50% of the amp rating (“V” models).
• Full power measurements are with a continuous sine wave at 1% clipping.
This would be encountered only in bench testing or driving a continuous
signal such as a siren. In normal operation, full-power peaks are usually brief
and rarely more than a 25%duty cycle. Continuous full-power operation is
generally possible at the lightest loading (8 ohms per channel for non-”V”
models; 50% loading for “V” models). This rating shows peak AC consump-
tion and performance in unusual applications.
• Thermal or overcurrent cutback limits duration of full-power operation at
heaviest load (2Ω or 100% load) after several seconds, and at half load (4Ω
or 50% load) after several minutes.
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203XC
8Ω 8+ Ω A8.0
A8.3A4.5A4.8
4Ω 4+ Ω A8.0
A0.6A9.8A41
2Ω 2+ Ω A8.0
A6.9A3.41A32
205XC
8Ω 8+ Ω A9.0
A6.5A0.8A5.21
4Ω 4+ Ω A9.0
A0.9A3.31A12
2Ω 2+ Ω A9.0
A41A12A43
207XC
8Ω 8+ Ω A9.0
A0.5A4.8A8.51
4Ω 4+ Ω A9.0
A9.7A5.31A62
2Ω 2+ Ω A9.0
A8.11A22A24
209XC
8Ω 8+ Ω A9.0
A0.6A11A02
4Ω 4+ Ω A9.0
A5.9A71A33
2Ω 2+ Ω A9.0
A41A72A05
2011XC
8Ω 8+ Ω A9.0
A6.7A1.31A52
4Ω 4+ Ω A9.0
A6.11A02A93
2Ω 2+ Ω A9.0
A6.61
V203XC
V07+V07A8.0
A7.5A8A61
V206XC
V07+V07A9.0
A7.8A31A12
V2021XC
V07+V07A9.0
A21A91A93