The QSC GX5 is a 2-channel, 2RU rackmount power amplifier engineered for live sound applications and portable PA setups. It features a Class H (2-tier) output circuit topology designed to efficiently shift power rails to match the signal demand. [1, 2, 3, 4, 5]Power Ratings & OutputThe power ratings are measured at 1 kHz (single or both channels driven): [1]

• 8 Ohms (Both Channels Driven): 500 Watts per channel
• 8 Ohms (Single Channel Driven): 600 Watts
• 4 Ohms (Both Channels Driven): 700 Watts per channel
• 4 Ohms (Single Channel Driven): 850 Watts
• 2 Ohms (Both Channels Driven): 350 Watts per channel
• Note: Channel bridging is not supported on this model. [1, 2, 3, 4]

Audio Performance

• Frequency Response: 20 Hz – 20 kHz (+0, -1 dB)
• Signal-to-Noise Ratio (20 Hz - 20 kHz): 100 dB
• Total Harmonic Distortion (THD): < 0.02% at 8 ohms; < 0.05% at 4 ohms (1 dB below rated power, 1 kHz)
• Voltage Gain: 34.4 dB
• Input Sensitivity: 1.2 V RMS
• Input Impedance: > 20 kΩ (Balanced)
• Maximum Input Level: +24 dBu (16 V RMS)
• Damping Factor: 100 [1, 2, 3]

I/O & Connections

• Input Connectors (Each Channel): 3-pin XLR (balanced), 1/4-inch TRS (balanced), and Phono / RCA (unbalanced)
• Output Connectors (Each Channel): Neutrik speakON / 1/4-inch TS combo jacks and standard 5-way binding posts [1, 2, 3, 4, 5]

Features & Protection

• GuardRail Technology: Automatically protects the amplifier and speakers from damage caused by clipping or excessive temperature without shutting down the system. [1, 2, 3]
• Crossover Switch: A rear-panel toggle activates a 100 Hz sub/satellite crossover, sending frequencies below 100 Hz to a subwoofer and frequencies above 100 Hz to the top box. [1, 2, 3]
• Cooling: Variable-speed, crosswise ducted fan (airflow from left to right). [1, 2]
• Front Panel Controls: Power switch and detented gain control knobs. [1, 2]
• Front Panel Indicators: Dual-color LEDs for Power (Blue/AC On), Signal (Green), and Clip (Red). [1, 2, 3]

Physical & Electrical Specs

• Form Factor: 19-inch rackmount, 2RU height
• Dimensions: 3.5 in (H) x 19 in (W) x 10.1 in (D) / 89 mm x 483 mm x 257 mm
• Weight: 26 lbs (11.8 kg) net weight
• Power Requirements: Draws 6 Amps at 120V AC under 1/8 power (pink noise at 4 ohms). It utilizes a standard internal toroidal power transformer.
•  This unit has been tested and puts out sound from both A and B speakers, the unit is in good condition with a few light scratches/scuffs, see in photos.

Important Notes: 

Does not include any cables, accessories, remote, or original packaging, unless listed, or in photos.

Please review all photos closely, as they form part of the description.