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ยี่ห้อ : QSC
รุ่น : QSC GX3
ราคา: 17,500 บาท
พิเศษ : 15,750 บาท
เครื่องขยายเสียง Power Amplifiers 8 ohm 2 x 300 W

QSC GX3 เครื่องขยายเสียง Power Amplifiers 8 ohm 2 x 300 W

Professional Power Amplifiers


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. 

 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

* At onset of clipping

All Specifications Subject to Change Without Notice.


XLR, 1/4" TRS and phono input connectors for compatibility with any source.Crossover
Subwoofer/Satellite crossover built-in.Outputs to Speakers
Speakon® combo output connector accepts 1/4" or Speakon 2 wire connectors.
Binding post output for compatibility with any loudspeaker wiring scheme

 Professional Power Amplifiers


Loudspeaker Compatibility Chart


ManufacturerSeriesModelImpedanceProgram (Music) Power Rating*Recommended Amplifier





JBLSoundFactorSF112i8 Ω500 WGX5

JBLSoundFactorSF1158 Ω500 WGX5

JBLSoundFactorSF1254 Ω1000 WGX5


JBLMProMP2128 Ω500 WGX5

JBLMProMP2158 Ω500 WGX5

JBLMProMP2254 Ω1000 WGX5

JBLMProMP255S4 Ω1000 WGX5

JBLMProMP4108 Ω600 WGX5

YamahaClubV**S112V8 Ω350 WGX3

YamahaClubV**S115V8 Ω500 WGX5

YamahaClubV**S215V4 Ω1000 WGX5

YamahaClubV**SM10V8 Ω250 WGX3

YamahaClubV**SM12V8 Ω350 WGX3

YamahaClubV**SW115V8 Ω500 WGX5

YamahaClubV**SW118V8 Ω600 WGX5

YamahaClubV**C112V(A)8 Ω350 WGX3

YamahaClubV**C115V(A)8 Ω500 WGX5

YamahaClubV**C215V4 Ω1000 WGX5

YamahaClubV**CM10V8 Ω250 WGX3

YamahaClubV**CM12V8 Ω350 WGX3

YamahaClubV**CW115V8 Ω500 WGX5

YamahaClubV**CW118V8 Ω600 WGX5

YamahaBR SeriesBR108 Ω250 WGX3

YamahaBR SeriesBR128 Ω300 WGX3

YamahaBR SeriesBR158 Ω400 WGX5

YamahaBR SeriesBR12M8 Ω300 WGX3

YamahaBR SeriesBR15M8 Ω400 WGX5

PeaveyPV® SeriesPV1158 Ω400 WGX5

PeaveyPV® SeriesPV2154 Ω700 WGX5

PeaveyPV® SeriesPV1128 Ω400 WGX5

PeaveyPV® SeriesPV1188 Ω400 WGX5

PeaveyPV® SeriesPV15M8 Ω500 WGX5

PeaveyPV® SeriesPV12M8 Ω500 WGX5

PeaveyPR® SeriesPR158 Ω400 WGX5

PeaveyPR® SeriesPR128 Ω400 WGX5

PeaveyPR® SeriesPR12N8 Ω400 WGX5

PeaveyPR® SeriesPR Sub8 Ω400 WGX5

EVForce I SeriesForce i8 Ω500 WGX5

EVForce I SeriesForce i Monitor8 Ω500 WGX5

B-52LXLX-15154 Ω800 WGX5

B-52LXLX-2188 Ω550 WGX5

Mackie C2008 Ω350 WGX3

Mackie C300z8 Ω500 WGX5

Cerwin Vega EL36B8 Ω500 WGX5


All specifications are taken directly from manufacturers' published data.

*If not published, this figure will be calculated as 2 x the continuous (RMS) power rating

** Earlier Club series models will have similar specifications

GX amplifier specified will deliver power within + or - 1 dB of Program Power Spec.

GX54 Ω550 Wto900 W

GX58 Ω400 Wto630 W

GX34 Ω335 Wto540 W

GX38 Ω240 Wto375 W

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