QSC PL340 1250-Watt Two-Channel Power Amplifier

  • 1250Watts per channel @4 ohms; 4000Watts per channel @4 Ohms Bridge Mono Mode
  • PowerLight switch-mode power supply for highest efficiency and improved audio performance
  • DataPort supports remote network control and monitoring via Q-SYS
  • Detented gain controls with 1-dB steps for precise calibration
  • Three selectable gain structures (26 dB, 32 dB, or 1.2 V)
SKU: 684284054852 Category: Tags: ,

This product has been discontinued


About QSC PL340 1250-Watt Two-Channel Power Amplifier

With PowerLight switch mode power supply, 1250 watts per channel into 4 ohms and class H topology, the QSC PL340 1250-watt two-channel power amplifier is ideal for live sound / production applications.

The PowerLight™3 Series is designed for the most demanding live audio users, whether in touring rigs or fixed installations. The most requested features of the PowerLight 2 series have been upgraded to deliver “the ultimate analog amplifier”, while the QSC DataPort ensures full compatibility with advanced digital processing and QSControl.net™. Three models range in power from 1250 watts to 4000 watts per channel at two ohms, all in two-rack space chassis that are only 15.6″ (40 cm) deep and 22 lb (10 kg).

In addition to higher power, the PowerLight 3 Series offers higher input voltage, selectable sensitivity, and easily adjusted rear panel switches with color coded LED indicators. For those users who simply want a high performance amplifier to go with their existing processor or console, the PowerLight 3 Series is an ideal choice, offering high power, excellent value, and zero signal latency. When complete integration of amplifier control, monitoring and DSP is desired, the PowerLight 3 Series is fully compatible with the QSControl.net™ BASIS™ networked audio platform, with its comprehensive drag and drop DSP functionality. Simpler DSP requirements can be met with the DSP-4 processing module.

The flagship of the PowerLight 3 Series is the new 8000 watt PL380. This highly refined, all-switchmode amplifier incorporates nearly 40 years of QSC engineering experience, resetting expectations for Class D audio quality. The PL380 combines a pair of 4000 watt Class D amplifier channels with the well proven PowerLight supply, to deliver more than twice as much audio power as previous 2 rack unit PowerLight amplifiers. Reactive “back EMF” from the speaker is recycled to the power supply, and unmatched “plug-to-plug” efficiency of 85% keeps AC power needs to a minimum, while delivering more energy to the speaker.

Years of patient development have resulted in outstanding 20 Hz – 20 kHz audio performance, plus complete protection from normal hazards of the trade. Even simple features such as dependably silent, surge-free on-off switching indicate the special care taken to keep things safely under control. The most pronounced “sonic signature” of the PL380 is one of immense headroom, sailing through even the most difficult loads with no signs of stress or change of tonality.

For lower power applications, the PL325 and QSC PL340 1250-watt two-channel power amplifier offer the same feature set, matched to upgraded versions of QSC’s most advanced linear amplifier platform. Recent advances in power supply capacitors further improve power and low-impedance performance, while continuing to offer the best available audio performance. As a result, designers have the choice of running a single type of amplifier throughout their rig, or matching amplifier performance to specific transducer types.

In keeping with normal QSC design standards, back-to-front airflow provides up to twice as much long-term average power as most competitors, without dumping hot air into the rack. QSC PL340 1250-watt two-channel power amplifiers are built in the same chassis size, with common back panel layouts to facilitate easy racking and hookup.


QSC PL340 1250-Watt Two-Channel Power Amplifier Features:

  • PowerLight switch-mode power supply for highest efficiency and improved audio performance
  • Flow-through air path and solid aluminum heat sinks for maximum cooling
  • DataPort supports remote network control and monitoring via Q-SYS
  • Detented gain controls with 1-dB steps for precise calibration
  • Removable knobs with lock-out security plate to prevent unauthorized tampering
  • User defeatable clip limiters and selectable low-frequency filter per channel (3 Hz, 30 Hz, or 50 Hz)
  • Three selectable gain structures (26 dB, 32 dB, or 1.2 V)
  • Front and rear panel LEDs indicate status of switch settings at a glance
  • Parallel XLR/M and XLR/F connectors for simple loop-through connectivity
  • Neutrik Speakon® and “Touch-Proof” binding post outputs
  • Neutrik Powercon® power cable remains secure on the road
  • 3 year warranty, plus optional 3 year extended service contract
  • Linear Class H output circuit offer double the typical efficiency of Class B, reducing AC current consumption and cooling requirements


QSC PL340 1250-Watt Two-Channel Power Amplifier Specifications:

both channels driven
8Ω EIA 1 kHz 1% THD500 W800 W1500 W
4Ω EIA 1 kHz 1% THD850 W1250 W2500 W
2Ω EIA 1 kHz 1% THD1250 W2000 W4000 W*
8Ω EIA 1 kHz 1% THD1700 W2600 W5000 W
4Ω EIA 1 kHz 1% THD2500 W4000 W8000 W*
Typical Distortion
(20 Hz–3 kHz, 3 dB below clip, or 20 Hz–5 kHz, 10 dB below clip, or 20 Hz–20 kHz, 20 dB below clip)
8 ohms
4 ohms
2 ohms
Maximum Distortion
(20 Hz–20 kHz, 1 dB below rated power)
4 to 8 ohms
Frequency Response (8 ohms)20 Hz–20 kHz, ±0.2 dB
Noise (20 Hz–20 kHz, 32 dB Gain)-106 dB-105 dB-104 dB
Dynamic Headroom (4 ohms)2 dB
Damping Factor (8 ohms)500200
Output CircuitryClass H (2-tier)Class D
Input Sensitivity
26 dB Setting
32 dB Setting
Maximum Gain (1.2V setting)34.5 dB36.4 dB39.1 dB
Maximum Input Level
1.2V setting
32 dBu setting
26 dBu setting
11 V (+23 dBu)
14.6 V (+25.5 dBu)
25 V (+30 dBu)
10 V (+22 dBu)
22 V (+29 dBu)
25 V (+30 dBu)
AC Power Requirements **
120V 50/60 Hz
230V 50 Hz
8.5 A
7.5 A
12 A
7 A
18 A
11 A
120V 50/60 Hz
230V 50 Hz
CEE 7/7 16A
CEE 7/7 16A
Chassis Power Connector
All Voltages
20A PowerCon32A PowerCon
Input Impedance> 10 kΩ balanced, or unbalanced
CoolingVariable-speed fan, rear-to-front air flow
Connectors (each channel)Input: XLR Male, XLR Female and 3-pin detachable terminal blocks (1 each per channel)
Output: Neutrik Speakon® (ch 1 wired to both channels) and 5-way binding posts
DataPort: HD-15, input signal in parallel with XLR input connectors
Front ControlsAC power switch
Gain controls, 21 detents, 1 dB steps (each channel)
Front Indicators (LED color)Power (Blue)
Bridged (Yellow)
Parallel (Orange)
Clip/Prot (Red × 2)
Level -10 (Orange × 2)
Level -20 (Green × 2)
Signal -35 (Green × 2)
Rear Controls (with LED indicators)Input Mode: Bridge (Yellow), Stereo (Green), or Parallel (Orange)
Gain / Sensitivity: 26 dB (Orange), 32 dB (Green), or 1.2V (Yellow)
High Pass (each channel): 3 Hz (Off), 30 Hz (Yellow), or 50 Hz (Orange)
Clip Limiter (each channel): Off, on (Yellow)
Amplifier and Load ProtectionShort circuit, open circuit, thermal, RF protection. On/off muting, DC fault shutdown, active inrush limiting
DimensionsHeight: 3.5″ (8.9 cm) 2RU
Width: 19″ (48.3 cm)
Depth: 15.63″ (39.7 cm) from front mounting rails
WeightNet: 22 lb (10 kg)
Shipping: 31.5 lb (14.3 kg)
Net: 24 lb (11 kg)
Shipping: 33.5 lb (15.2 kg)
Agency ApprovalsUL, CE, RoHS/WEEE compliant, FCC Class B (conducted and radiated emissions)

U.S. Patent no. 5767744 and patents pending
*Burst mode testing required due to AC service current limitations
** Representative of current draw with typical music program material with occasional clipping

All specifications are subject to change without notice.

Additional information

Weight32.22 lbs
Dimensions24 x 22 x 7 in


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