Product Description
GX Series amplifiers are ideal for professional entertainers who require maximum performance and portability on a limited budget. The hallmarks of the QSC brand professional audio quality, meticulous engineering, precision manufacturing and long-term reliability – are all intrinsic to GX. Add contemporary styling, multiple input/output options, light weight, and advanced protection circuitry, and the GX Series clearly represents real value – something everyone can use.
Technical Notes
The GX3 uses the latest evolution of the QSC Grounded Collector output system, for optimum cooling of the critical power transistors. A true Class B biasing system combines maximum thermal efficiency with excellent audio performance.
The GX5 uses a Class H system, based on key elements of the PL Series, (PLX, PL3, CX, DCA) almost doubling power in the same size and weight. QSC design expertise allows the output devices to shift from low-power to high-power rails in less than a millionth of a second, ensuring that the output power is always right where it needs to be without excess loss.
Both amplifiers use premium toroidal power transformers for reliable “mid-weight” performance. A variable-speed fan moves air crosswise through the amplifier, drawing cool air in over the power transformer, through the fan, and then over the heat sink. This keeps the transformer cool and allows a full size heat sink to fit in a down-sized chassis.
The GX7 adds the road-proven PowerLight supply to the Class H output section, for more overall output power and additional weight savings. The result is one of the highest power-to-weight ratios in the industry. A low-noise variable-speed fan with rear-to-front airflow keeps amplifiers and racks cool.
| SPECIFICATIONS | GX3 | GX5 | GX7 | |||
| Output power per channel | ||||||
| 8 ohms / 1 kHz (both channels driven) | 300 W | 500 W | 725 W | |||
| 8 ohms / 1 kHz (single channel driven) | 350 W | 600 W | 800 W | |||
| 4 ohms / 1 kHz (both channels driven) | 425 W | 700 W | 1000 W | |||
| 4 ohms / 1 kHz (single channel driven) | 500 W | 850 W | 1200 W | |||
| Distortion (1 dB below rated power, 1 kHz) | 8 ohms: less than 0.02% 4 ohms: less than 0.05% |
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| Signal to Noise (20 Hz – 20 kHz) | 100 dB | |||||
| Input Sensitivity | 1.2 V rms | |||||
| Voltage Gain | 32.2 dB | 34.4 dB | 36.1 dB | |||
| Output Circuitry | Class B | 2-tier Class H | 2-tier Class H | |||
| Power Requirements (1/8 power, pink noise at 4 ohms, 120V) | 6.3 A | 6 A | 10.1 A | |||
| Frequency Response | 20 Hz–20 kHz, +0, -1 dB | |||||
| Dynamic Headroom (4 ohms) | 2 dB | |||||
| Input Impedance | Greater than 20 kΩ (balanced) | |||||
| Maximum Input Level | +24 dBu (16 V rms) | |||||
| Input Connectors (each channel) | 3-pin XLR and 1/4″ TRS, balanced, parallel Phono, unbalanced |
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| Output Connectors (each channel) | Speakon®, 1/4″, Binding posts | |||||
| Amplifier and Load Protection | Short circuit, open circuit, thermal, RF protection Load protected against DC faults |
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| Front Panel Controls and Indicators | Gain controls, 21 detents Red CLIP LEDs, proportional, 0.1% THD threshold Green SIGNAL LEDs, threshold 35 dB below clipping Blue POWER LED, AC on |
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| Rear Panel Controls | Full Range / Crossover switch 100 Hz, 3rd order LP (sub), 2nd order HP (top) |
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| Dimensions | Height: 3.5″ (89 mm) 2RU Width: 19″ (483 mm) Depth: 10.1″ (257 mm) |
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| Weight | Net: 27 lb (12.1 kg) Shipping: 31 lb (14.1 kg) |
Net: 28 lb (12.6 kg) Shipping: 32 lb (14.6 kg) |
120V model: Net: 15.5 lb (7 kg) Shipping: 20.5 lb (9.3 kg) 230V model: Net: 16.5 lb (7.5 kg) Shipping: 21.5 lb (9.75 kg) |
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| Agency Approvals | UL, CE, RoHS/WEEE Compliant | |||||
| AC Current and Heating, 120 VAC (multiply current by 0.5 for 230 VAC) |
GX3 | GX5 | GX7 | |||
| Operating Condition | AC amps | BTU/hour | AC amps | BTU/hour | AC amps | BTU/hour |
| Idle | 0.2 | 44 | 0.3 | 60 | 0.6 | 82 |
| 8 + 8 ohms, 1/8 power 1 | 4.1 | 904 | 3.3 | 734 | 6.7 | 1169 |
| 8 + 8 ohms, 1/3 power 2 | 6.1 | 1160 | 8.5 | 1456 | 13.3 | 1807 |
| 8 + 8 ohms, full power 3 | 9.75 | 1109 | 16.2 | 1891 | 26.5 | 2167 |
| 4 + 4 ohms, 1/8 power 1 | 6.3 | 1515 | 5.8 | 1160 | 10.1 | 1963 |
| 4 + 4 ohms, 1/3 power 2 | 9.4 | 2105 | 11.2 | 2162 | 18.5 | 2612 |
| 4 + 4 ohms, full power 3 | 15.0 | 2297 | 24.5 | 3754 | 40 | 4478 |
1 1/8 power represents typical maximum operating conditions
2 1/3 power represents over-driven program levels
3 Full power is breaker limited to short periods
For 230 V, multiply AC current by 0.5
For 100 V, multiply AC current by 1.25
Resources:
- User Manual : Click Here
