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QSC PLX-1104 - PLX2 Series Stereo Power Amplifier

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The QSC PLX1104 is a lightweight rackmount stereo power amplifier, offering up 325 Watts per side at 8 Ohms, and weighing in at a mere 13 lbs. The unit is designed to power one or two speakers from each amplifier channel (4 ohm minimum loading), and offers a simplified feature set while retaining uncompromised PLX performance and technology.

The PLX1104 is a worthy solution for either high-quality portable P.A. amplification use, or in a studio situation as a reference playback alternative.

Û¢ Lightweight, high-output stereo rackmount power amplifier
Û¢ 21-position front-panel gain controls for precise, repeatable amplifier adjustment
Û¢ Cooling design with front-exit hot air exhaust, Flow-through heat sinks require no filters, eliminating clogging
Û¢ Full short circuit, open circuit, thermal, infrasonic, ultrasonic, and RF protection, stable into reactive or mismatched loads
Û¢ Clip limiting protects speakers; thermal limiting maintains operation even during abnormal overload conditions
Û¢ Front panel LED power, clip, -10 dB, and signal present indicators for system monitoring and troubleshooting
Û¢ Balanced XLR inputs with parallel TRS connectors and loop-through support
Û¢ Speakon(TM) NL-4 output connectors with positive-locking speaker connection; Ch. 1 output uses all 4 wires for single-cable connection to bi-amplified speakers
Power Rating
Rating @ 1 kHz, THD=0.1%
550W @ 4 ã_ Stereo (per channel)
325W @ 8 ã_ Stereo (per channel)

Rating @ 20 Hz - 20 kHz, THD=0.05%
500W @ 4 ã_ Stereo (per channel)
310W @ 8 ã_ Stereo (per channel
Damping Factor
Input Sensitivity
1.18 Vrms @8 Ohms
Input Impedance
20 kOhms, balanced
10 kOhms, unbalanced
32.5dB (@8 Ohms)
Frequency Response
20Hz - 20kHz, -0.5dB
Signal-to-Noise Ratio
-106dB, 20 Hz - 20 kHz
Total Harmonic Distortion (THD)
Input Connections
2 x XLR female, balanced
2 x 1/4" TRS phone, balanced
Output Connectors
2 x NL-4 Speakon (both channels available on Ch.1 output)
Controls Front Panel
2 x rotary Level Control knobs
1 x Power switch
Controls (Rear)
1 x Circuit Breaker
2 x Ch.1,2 red Clip LEDs
2 x Ch.1,2 green -10dB LEDs
2 x Ch.1,2 green -35dB signal LEDs
1 x blue Power LED
1 x variable-speed fan (back-to-front airflow)
Power Consumption
1/8 power (pink noise)
@8 Ohms: 5.0A/120V
@4 Ohms: 8A/120V
1/3 power (pink noise)
@8 Ohms: 8.0A/120V
@4 Ohms: 12.4A/120V
Full Power
@8 Ohms: 12.6A/120V
@4 Ohms: 21A/120V
Power Requirements
100, 120 or 220-240 VAC, 50- 60 Hz
19 x 3.5 x 11" (483 x 89 x 279mm)
13 lbs (5.9 kg)
Detented Level Attenuators
Comprehensive Protection Circuitry
On/Off Muting, DC-fault Power Supply Shutdown
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