u Stewart Audio - PA-50B
Stewart Audio


2 Channel Half Rack Amplifier - 25W x 2 @ 8Ω

Two channel half-rack amplifier designed to meet the rigorous demands of pro audio installations. The PA series is a proven line of amplifiers with thousands in operation across the world.

  • • Compact Half Rack Package
  • • Two Channel Amplifier, Optimized to drive 4/8Ω
  • • Convection Cooled (No Fans)
  • • Clean Full–Range Dynamic Power
  • • World Class Reliability
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The PA Series was specifically designed to meet the rigorous requirements of Sonic Accuracy, High Efficiency, Low Power consumption and extended duty cycles all in a very compact Half Rack Package. Low cost, lightweight and convection cooling make this amplifier perfect for high quality commercial, industrial and Pro Audio sound installations. Our flexible design allows bridging to mono for increased power and will also accept balanced or unbalanced signals by way of 1/4" TRS input connectors. With thousands in operation across a broad range of applications, this hardworking Class AB amplifier has passed the test of time again and again.

8 Ohm Stereo Power 25W
4 Ohm Stereo Power 50W
8 Ohm Bridged Power 100W
Frequency Response(+0, -0.5 dB, 1W) 20Hz - 20kHz
Power Bandwidth (+3, -3dB) 5Hz - 100kHz
THD+N <.1%
Signal to Noise Ratio >100dB
Damping Factor>200
Slew Rate 30V/microsecond
Input Sensitivity 1V (0 dBV)
Standard Voltage Gain 40x (32dB)
Input Impedance (Balanced/Unbalanced) 20k Ohms
Idle Current Draw, 1/8 Power Draw 0.13/0.56A
Class AB
Input Connectors TRS
Output Connectors Terminal Strip
Power Supply High-speed Switching
Cooling Convection-Cooled (No fans)
Controls Power, Channel Gain
LED Indicators Power & Clip
Construction Steel & Aluminum Chassis
Dimensions (H,W,D) 1.75"H x 8.2"W x 6.2"D
Weight 3.5lbs
Warranty 3 years

Product Datasheet PDF
User Manual PDF

Faceplate Options Stencil Library - Visio Editable VSD