Description
The QSC GX3 425-watt power amplifier gives your speakers the power they need while giving you the efficiency and protective features you want for easy operation and peace of mind. The GX3 uses advanced components for both light weight and reliability. Its Guardrail protection allows delivery of peak power while preventing overloads. It’s equipped with a crossover switch, so adding a subwoofer to your system is a snap. Optimized for 4- and 8-ohm speakers, this amp also fits perfectly into popular racks, and its lightweight design (less than 30 lbs.) makes the GX3 incredibly easy to transport.
At just 12.1 kg, the GX3 is light enough to cart around – but we’re seeing most of these get picked up once, plonked into a fixed installation and left to do their thing. They’re loaded up with all the usual protection features you’d expect these days from an amplifier: Short circuit, open circuit, thermal, RF protection, and load protected against DC faults. Plenty of connectivity with inputs via 2 x XLR, balanced 1/4″ and also RCA.
QSC GX Series – 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.
Output power:
- 8 ohms / 1 kHz (both channels driven): 300W
- 8 ohms / 1 kHz (single channel driven): 350W
- 4 ohms / 1 kHz (both channels driven): 425W
- 4 ohms / 1 kHz (single channel driven): 500W
Specifications
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% |
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-inch TRS, balanced, parallel
Phono, unbalanced |
Output Connectors (each channel) |
Speakon®, 1/4-inch, Binding posts |
Amplifier and Load Protection |
Short circuit, open circuit, thermal, RF protection
Load protected against DC faults |
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 |
Rear Panel Controls |
Full Range / Crossover switch
100 Hz, 3rd order LP (sub), 2nd order HP (top) |
Product Dimensions (H×W×D) |
89 × 483 × 257 mm
3.5 × 19 × 10.1 in |
Carton Dimensions (H×W×D) |
610 × 380 × 153 mm
24 × 15 × 6 in |
Net Weight |
12.1 kg / 27 lb |
12.6 kg / 28 lb |
120V model: 7 kg / 15.5 lb
230V model: 7.5 kg / 16.5 lb |
Shipping Weight |
13.2 kg / 29.1 lb |
14.5 kg / 32 lb |
120V model: 9.3 kg / 20.5 lb
230V model: 9.75 kg / 21.5 lb |
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