Stewart Audio PA50B Data Sheet

PA Half Rack Series
Power Amplifier
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 Amp perfect for high quality commercial, industrial and
Pro Audio sound installations. Our flexible design allows bridging
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.
PA50B
50W x 2 @ 4 Ohms 25W x 2 @ 8 Ohms 100W x 1 @ 8 Ohms bridged
Features:
Compact Half Rack Package
Two Channel Amplifier, Optimized To
drive 4 Ohm And 8 Ohm loads
Convection Cooled (No Fans)
Clean Full–Range Dynamic Power
World Class Reliability
Bridgeable
Ultra Efficient Switch Mode Power Supply
Made In The USA
Applications:
Audio Video Production
Pre/Post Productions
Project Studios
Broadcast Applications
Instrument Rigs
Sound Reinforcement
Fixed installations with amplifiers
located in listening environment
14397 Cuesta Court Ste D1 • Sonora Ca 95370 • TEL: 209.588.8111 • www.stewartaudio.com
PA50B
50W x 2 @ 4 Ohms 25W x 2 @ 8 Ohms 100W x 1 @ 8 Ohms
Specifications
8 Ohm Stereo Power 4 Ohm Stereo Power 8 Ohm Bridged Power Frequency Response (+0, –0.5 dB, 1W) Power Bandwidth (+3, –3 dB) THD+N Damping Factor Slew Rate Input Sensitivity Standard Voltage Gain Input impedance (Balanced / Unbalanced) Idle Current Draw SW On & 1/8 power draw Class Input Connectors Output Connectors Power Supply Cooling Controls LED Indicators Construction Dimensions (height, width, depth) Weight Warranty
25 W 50 W 100 W 20 Hz—20 kHz 5 Hz—100 kHz >98dB >200 30V/microsecond 1V (0 dBV) 40X (32dB) 20k Ohms/10k Ohms
0.13/0.56 Amps A B TRS Terminal Strip High Speed Switching Convection–Cooling (No Fans) Power on/off, Channel Gain Power & Clip Steel & Aluminum Chassis
1.75”H x 8.2” W x 6.2” D
3.5 lbs 3 years
Architects & Engineering Specifications
The power amplifier shall consist of 2 channels. Model PA50B shall deliver a minimum of 25W at 8 Ohms , both channels driven, 20 Hz—20 kHz, < .1% THD. The amplifier shall be convection cooled with no fan required. Amplifiers using fan cooling will not be accepted. The amplifier shall have circuitry to protect itself and the speaker loads from output short circuits, DC voltage on the outputs, and thermal overload. The amplifier shall have a voltage gain of 40X (32dB) and an input Sensitivity of 1V for rated power at 4 Ohm output. The hum and noise level shall be greater than 98 dB below rated output “A” weighted. The amplifier shall have a high–speed Switch Mode Power Supply. Non Switch Mode Power
Supplies will not be accepted. The frequency response shall be greater than 20Hz to 20 kHz +0, – 0.5dB at rated power. The amplifier shall operate on 120VAC. The front panel shall contain, for each channel, a thru-panel adjust, level control, LED indicators for Clip, and Power. The power switch shall be a power supply enable switch. The Rear panel shall have a captive AC line cord, 1/4” TRS input terminals and terminal strip output terminals. The PA50B shall weigh 3.5lbs (1.6kg) and shall be 8.2” (20.8 cm) wide,
1.75” (4.6 cm) high, and 6.2” (15.7cm) deep. The amplifier shall be designated the Stewart Audio Model PA50B.
14397 Cuesta Court Ste D1
Sonora Ca 95370
TEL: 209.588.8111
www.stewartaudio.com
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