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ยี่ห้อ : QSC
รุ่น : QSC GX5
ราคา: 23,000 บาท
พิเศษ : 20,700 บาท
เครื่องขยายเสียง ราคาเครื่องเสียงกลางแจ้ง Power Amplifiers 8 ohm 2 x 500 W

QSC GX5 เครื่องขยายเสียง ราคาเครื่องเสียงกลางแจ้ง Power Amplifiers 8 ohm 2 x 500 W


GX3  |  GX5


Your Speaker's Power Rating


GX3For 8 ohm speakers: 
250 W - 350 W (program)*

GX5For 8 ohm speakers: 
400 W - 600 W (program)**

* For 4Ω speakers: 350 W - 500 W (program)
** For 4Ω speakers: 550 W - 900 W (program) 


Which GX amplifier is best for my loudspeakers?

Choose your loudspeaker model from a list and the amplifier selector can tell you which amplifier is right for you. 
Find the right GX model for your loudspeakers 


GX Series amplifiers are ideal for professional entertainers who require maximum performance and portability on a limited budget. QSC designers, headed by Pat Quilter, have optimized output and appearance while reducing raw material cost and weight. It's all here – dramatic styling, easy hookup and adjustments, excellent audio quality and QSC reliability. 

GX amplifiers deliver just the right amount of power to the most popular speakers used by entertainers. Most loudspeaker manufacturers recommend an amplifier with power output equal to the speaker's "Program (Music) Power" rating or two times (2 x) the "Continuous (RMS) Power" rating. 

The GX3 is ideal for speakers in the 300 watt (Program) range, while the GX5 provides full performance for 500 watt (Program) speakers. Both models supply maximum possible power to 4 ohm and 8 ohm loads. Owners of popular 4 ohm loudspeakers (dual-woofer, two-way models and many subwoofers) will find the 700 watt (4 ohm) power of the GX5 an ideal match. 

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 PLX Series, 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. As always, the amplifiers are fully protected from the usual hazards of the trade, ensuring stable performance and long life. 

Professional Power Amplifiers

All specifications refer to pre-production samples and are subject to change without notice.


GX Series


8 ohms / 1 kHz (both channels driven)300 W500 W

8 ohms / 1 kHz (single channels driven)350 W600 W

4 ohms / 1 kHz (both channels driven)425 W700 W

4 ohms / 1 kHz (single channels driven)500 W850 W

Distortion (typical) 
  20 Hz - 20 kHz, 1 dB below rated power 
 8 ohms: less than 0.05%
4 ohms: less than 0.1%

Signal to Noise (20 Hz - 20 kHz)100 dB

Input Sensitivity1.2 Vrms

Voltage Gain (8 ohms)32.2 dB34.4 dB

Output CircuitryClass B2-tier Class H

Power Requirements (1/8 power, pink noise at 4 ohms, 120V)6.3A6A

Frequency Response20 Hz - 20 kHz, +0, -1 dB

Dynamic Headroom (4 ohms)2 dB

Input Impedance (ohms)Greater than 20k (balanced)

Maximum Input Level
 +24 dB (16 Vrms)

Input Connectors (each channel)3-pin XLR and 1/4" TRS, balanced, parallel
Phono, unbalanced

Output Connectors (each channel)Speakon®, 1/4", Binding Posts 

Amplifier and Load ProtectionShort circuit, open circuit, thermal, RF protection
Load protected against DC faults

Front Panel Controls and IndicatorsGain controls, 21 detents
Red Clip LEDs, proportional, 0.1% THD threshold
Green Signal LEDs, threshold -35 dB
Blue Power LED, AC on

Rear Panel ControlsFull Range / Crossover switch
100 Hz, 3rd order LP (sub), 2nd order HP (top) 

DimensionsHeight: 3.5" (89 mm) 2RU
Width: 19" (483 mm)
Depth: 10.1" (257 mm)

WeightNet: 27 lbs (12.1 kg)
Shipping: 31 lbs (14.1 kg)Net: 28 lbs (12.6 kg)
Shipping: 32 lbs (14.6 kg)

Agency ApprovalsUL, CE, RoHS/WEEE Compliant

AC Power Consumption 

AC Current and Heating, 120 VAC


Operating ConditionAC ampsBTU / hrAC ampsBTU / hr


8 + 8 ohms, 1/8 power 14.19043.3734

8 + 8 ohms, 1/3 power 26.111608.51456

8 + 8 ohms, full power 39.75110916.21891

4 + 4 ohms, 1/8 power 16.315155.81160

4 + 4 ohms, 1/3 power 29.4210511.22162

4 + 4 ohms, full power 315.0229724.53754

1 1/8 power represents typical operating conditions
2 1/3 power represents peak 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

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