Specifications

TI 323 (6.0E)
10 - 36
3.3. Mains power supply
requirements
Power consumption of amplifiers is dependent on many
factors including load impedance, signal level and signal
characteristics (speech, music). A key factor in estimating
amplifier power consumption is the crest factor (CF) of
the applied signal. The crest factor is a measure for the
ratio of peak to RMS voltage of a signal.
The table below shows the total average output power
and the corresponding power consumption of a P1200A
(the figures are similar for an A1), driving 4 ohm loads
(both channels) to the clipping point of both mainframe
power amplifiers.
Signal CF P
out
P
in
Squarewave 1 1900 W 2600 W
Sinewave 1.4 1200 W 1830 W
Pinknoise/
compressed
music
3.5 200 W 500 W
Dynamic music 5 100 W 300 W
Speech/highly
dynamic music
8 40 W 200 W
In reality, even if the system is driven hard, with
compressed music, limiters engaged, the average power
consumption will hardly exceed 1000 Watts per
mainframe. Standard power supply ratings of
16 A/230 Volts allow up to 3 P1200A/A1 mainframes to
be connected. A single phase 32 A takes up to 6
mainframes etc. Standard power supply ratings of 30 A/
100-115 V can also accommodate 3 mainframes.
The built in soft start circuitry limits each mainframes
inrush peak current to 5 A/230 V (10 A/100-115 V). This
prevents circuit breakers from tripping.