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Earthquake - XJ-300ST - Power Amplifier


Earthquake - XJ-300ST - Power Amplifier

The best-selling XJ-300FR amplifier has been updated to have a 12V trigger. The XJ-300ST maintains characteristics of the small unimposing, connectable design while still packing all the power and flexibility that made the XJ-300FR so popular.This 12V trigger allows the user to power the amplifier through an outside source.

Keeping flexibility and spatial convenience in mind, Earthquake has kept their patented EQ Interlock design so that two amplifiers can be clicked together resulting in a 4-channel amplifier while only using 1U of rack space. The small size of the XJ-300ST is made even more convenient by its unbelievable amount of cool running power. Approaching 99% efficiency the XJ amp never gets hot, allowing it to be placed in a tight rack surrounded by other components.

Endless configuration scenarios allow the XJ-300ST amplifier to be used as a mono (bridged) amplifier, 2.1 channel amplifier, 2-channel amplifiers 4/8/12 and 16-channel amplification with industry leading power density and efficiency.

At only one rack U high and half a rack in width, plus the installation options makes this compact, versatile class J amplifier the go to amp for installers.

The XJ-300ST produces continuous rock solid power - 110 Watts RMS at 8 ohms per channel and 300 Watts RMS bridged into 4 ohm. This massive power capability is possible due to the advanced nature of the patented Class J output stage. The switching frequency of the output and the voltage of the power supply are modulated in real time based on the frequency and amplitude content of the input. No other amp can match the efficiency and power of Class J.


  • Wall or rack mountable
  • Class “J” Stereo Modular design
  • Auto Signal/Music Sensing
  • Built in room corrections and 0 - 180° phase adjustments
  • RCA Input
  • 12V Trigger Input
  • Volume control
  • 50 – 160Hz built in crossover
  • 110V/220V Selectable


Manufacturer: Earthquake
Model Number: XJ-300ST
Type: Power Amp



8 Ohm Load: 2 x 110 WRMS
4 Ohm Load: 2 x 170 WRMS
Mono Bridged:
8 Ohm Load: 170 WRMS
4 Ohm Load: 300 WRMS

S/N Ratio: >97 dB
Total Harmonic Distortion (THD): 0.08%
Frequency Response: 20Hz - 20kHz
Connection Type/Input: RCA, 12V Trigger
Connection Type/Output: Binding Posts


Power Consumption: 110-120AC / 60Hz / 180W
Dimensions: H 8.5" x W 8" x D 2.06"
(H 216mm x W 204mm x D 53mm)
Shipping Dimensions: N/A
Weight: 3.8 lbs. (1.7 kg)
Shipping Weight: N/A
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