Stewart Audio PA 50B

2-channel Power Amplifier, 50W RMS/ch at 4 Ohms, with Silent Cooling Design, Half-rack Spaced, Class AB, Barrier Strip Outputs
Stewart Audio PA 50B image 1
Stewart Audio PA 50B image 1
Sweetwater Savings: $60.00 MSRP: $449.00

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Stewart Audio PA 50B
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Half-rack power!

Whether you are looking to power passive studio monitors, or other low-powered speakers, the Stewart PA-50B Power Amp will fulfill your needs. World-class reliability and clean full-range power will give you great sounding audio. At 25W per channel at 8 ohms, and 50W per channel at 4 Ohms, this half-rack sized amp is an excellent choice for your studio. The passive cooling design guarantees no fan noise will be present, unlike other amplifiers, keeping your mix sounding the best it can.

Stewart Audio PA 50B Features:
  • 2-ch
  • 25W/ch @ 8ohms
  • In: 2 x TRS
  • Out: barrier strip

Additional Media

Power Amp Buying Guide
Studio Monitor Buying Guide

Tech Specs

Number of Channels 2
Power Class Class AB
Watts/Side @ 8 ohms 25W
Watts/Side @ 4 ohms 50W
Watts Bridged 100W @ 8 ohms
Cooling System Convection Cooled
Inputs 2 x 1/4"
Outputs Barrier Strip
Rack Spaces Half (1U)
Height 1.7"
Depth 6.2"
Width 8.2"
Weight 3.5 lbs.
Manufacturer Part Number PA-50B

Customer Reviews

Based on 2 reviews
Write your review

Still running all the Stewart Amps

These are great amps, all are still working, same as new. Best: JD Letson

Half Rack Stewart Audio amps

I am using the PA 50B to drive the compression horns in a multi-amped studio monitor/instrument speaker setup. I also have two of the PA 100B amps for the mid-bass (see my review on those). I am also pleased with this amp although it actually runs a little warmer to the touch than the PA 100B's. Also, there is a slight turn-on click when turning this amp on and off. It is not a big deal, but when it is only driving a compression horn that makes it more noticeable. The factory told me the the turn-on click is normal in the PA 50B and not in the PA 100B because the two amps have different turn-on delay schemes. The amps sounds great, runs cool, and takes up very little space.
Music background: Hobbyist musician and speaker builder.
See also: Power Amps, Stewart Audio, Stewart Audio Power Amplifiers, Stewart Audio Monitor Amplifiers