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PA4 Series

4-Channel Professional Amplifiers

The PA4 Series amplifiers combine 4 discrete high-power amplifiers in a single rugged chassis while providing extremely high-quality sound. The PA4 Series amplifiers are especially suited for monitor application in clubs or touring applications where a rugged, compact amplifier is required.



 Very light weight, 250W (rms) x 4, only 12.5Kg.

 High power density, only 10" deep. All four channel models built with 2U rack high chassis.

 Compact size is excellent for touring or fixed installation applications.

 4 Independent Channels or Dual Bridge Mode (Hi-Power) operation.

 Powerful, high current, low noise toroidal transformer matched with 60,000µF capacitance.

 To prevent large start-up currents, a soft power-up limiter is standard on all models.

 Ultra-low distortion (<0.01%) circuitry and high current output stage for punch.

 Switchable limiter reduces clipping distortion and protects speakers from being overdriven.

 Selectable high pass filter 35 or 70Hz, prevents woofer speaker over excursion or when full band-width is not required.

 Balanced XLR input and two balanced TRS phonejacks for cascading amplifiers.

 Quiet, auto-variable speed fan, forced air cooling system.

 Detent volume controls.




Condition PA-4104 PA-4154 PA-4254 PA-4404
4 ohm one Ch. 120W 170W 280W 450W
4 ohm four Ch. 100W x 4 150W x 4 250W x 4 400W x 4
Output(rms) 8 ohm one Ch. 70W 100W 170W 280W
Output(rms) 8 ohm four Ch. 60W x4 90W x 4 150W x 4 250W x 4
Output(rms) 8 ohm bridged 200W x 2 300W x 2 500W x 2 800W x 2
Distortion At rated power <0.01%
I/O connector   XLR x 4, TRS 8, SPEAKONTM x 4
Status indicator   signal, Clip, Protect, ON
Controls   4 Level controls, 2 Mode selectors, 2 Limiter enable switches, 4 HP Filter selectors, GND/Lift switch
Protection   Turn-on, Short, DC, Over temperature
Dimension 2U Rack 3 1/2"(H) x 19"(W) x 10"(D) 15"(D)
Cooling   Two variable speed fans
Freq. response At rated power 20Hz~20kHz +0, -0.5dB
Freq. bandwidth At rated power 10Hz~50kHz +0, -3 dB
Input sensitivity At rated power 0.775 Vrms
IM distortion 60Hz and 7kHz <0.03%
Input impedance Each leg to GND 10k ohm
Damping factor 1 kHz@8 ohm >200
Crosstalk   <-100 dB
Noise At rated power <-105 dB
Slew rate   20V/uS 30V/uS 30V/uS 40V/uS
Voltage gain   31dB 32dB 33dB 34dB
Power supply   600W 900W 1400W 2400W
Max current draw AC115V(230V) 6(3)A 8(4)A 10(5)A 20(10)A

lbs (kg)

22 (10) 24 (11) 27 (12.5) 40 (18)
 All specifications subject to change without prior notice
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