Stewart Audio PA50B 2 Channel Half Rack Amplifier - 25W x 2 @ 8Ω

Article number: JSS-PA50B
Availability: In stock

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. 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.


  • Compact Half Rack Package
  • Two Channel Amplifier, Optimized to drive 4/8Ω
  • Convection Cooled (No Fans)
  • Clean Full–Range Dynamic Power
  • World Class Reliability


  • 8 Ohm Stereo Power: 25W
  • 4 Ohm Stereo Power: 50W
  • 8 Ohm Bridged Power: 100W
  • Frequency Response(+0, -0.5 dB, 1W): 20Hz
  • 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

WARNING: Cancer and Reproductive Harm. For more information go to

0 stars based on 0 reviews
By using our website, you agree to the use of cookies. These cookies help us understand how customers arrive at and use our site and help us make improvements. Hide this message More on cookies »