Qsc, Plx 1804

The compact PLX1804 brings the same performance and technology as the rest of the PLX2 Series, plus even greater value, to applications that don't require bridged or 2 ohm operation. Designed to power one or two speakers from each amplifier channel (4 ohm minimum loading), this model offer a simplified feature set while retaining genuine, uncompromised PLX performance and technology. Weighing just 13 pounds (5.9 kg), the "plug-and-play" PLX1804 is perfect for ultra-portable rigs, as well as reference-quality playback

Stereo Mode
8 ohms (each channel) *
FTC 20 Hz - 20 kHz 0.05% THD 550 W
EIA 1 kHz 0.1% THD 600 W

Stereo Mode
4 ohms (each channel) *
FTC 20 Hz - 20 kHz 0.05% THD 800 W
EIA 1 kHz 0.1% THD 900 W

Signal to Noise (20 Hz - 20 kHz) -106 dB
Input Sensitivity @ 8 ohms 1.20 Vrms
Gain @ 8 ohms : 35 dB
Output Circuitry 2-Tier Class H
Distortion (SMPTE-IM) Less than 0.02%
Typical Distortion
1/8 rated power, 20 Hz-20 kHz Less than 0.02%
Full rated power, 20 Hz-20 kHz Less than 0.02%

Frequency Response 20 Hz-20 kHz, -0.5 dB
Damping Factor Greater than 200
Input Impedance 20k ohms balanced , 10k ohms unbalanced
Input Clipping 5.5 Vrms (+15 dBu)
Cooling Variable-speed fan, rear-to-front air flow
Input Connectors, each channel 3-pin XLR and 1/4" TRS balanced
Output Connectors, each channel Neutrik® NL4 Speakon
(Both channels available on Ch 1 output)
Rear Panel Switches Circuit Breaker
Front Panel Controls Detented Gain Attenuator: 0 to ∞ dB
Power On/Off

Amplifier Protection

Full short circuit, open circuit, thermal, infrasonic, ultrasonic, and RF protection
Stable into reactive or mismatched loads
Load Protection On/off muting, DC-fault power supply shutdown
Infrasonic -3 dB, 6 Hz
DC fault Power supply shutdown
Ultrasonic -3 dB, 80 kHz
Short Circuit Muting
Thermal Limiting at 85° C, Muting at 90° C
Over Current Active clip limiting
AC circuit breaker
High Line Standard +15%, survive +25%
Low Line -40%


Height 3.5" (8.9 cm) 2 rack spaces
Width 19" (48.3 cm)
Depth, Rack mounting surface to rear panel 8.95" (22.7 cm)
Overall Depth 11" (27.9 cm)

Weight 13 lbs. (5.9 kg) net
18 lbs. (8.2 kg) shipping