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Earthquake - XJ-300ST - Power Amplifier

Earthquake - XJ-300ST - Power Amplifier
Earthquake - XJ-300ST - Power Amplifier Earthquake - XJ-300ST - Power Amplifier (Side) Earthquake - XJ-300ST - Power Amplifier (Rear) Earthquake - XJ-300ST - Power Amplifier (Rear)

Earthquake - XJ-300ST - Power Amplifier

Earthquake - XJ-300ST - Power Amplifier 

The special XJ technology also allows for a novel 2.1 configuration. With the XJ-300FR, it is possible to connect a third speaker between the 2 main channels. This matrix mono channel plays the combined content of both channels and is extremely useful for powering 2 satellites and a subwoofer. Adding to this flexibility is the new patented EQ Interlock design—two amplifiers can be linked together resulting in a 4 channel amplifier using only 1 rack U of space.

To begin any size installation, all you need is a given number of XJ-300ST amplifiers. You no longer have to buy a cumbersome mix of different amplifiers to achieve a certain number of channels or power level. With endless configuration scenarios, the XJ-300ST amplifiers can be used as mono (bridged) amplifiers, 2.1 channel amplifiers, 2-channel amplifiers, 4/8/12 and 16 channel amplification with industry leading power density and efficiency.

Approaching 99 percent efficiency, the XJ amp never gets hot and can be placed in a tight rack with components on all sides. At only 1 rack U high and half a rack in width, this is an amazing achievement.

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.


  • Compact size: 8 ½ in (W) x 8 in (D) x 1 7/8 in (H)
  • Wall or rack mountable
  • Class “J” Stereo Modular design
  • Auto Signal/Music Sensing
  • Built in room corrections and 0 - 180° phase adjustments
  • RCA and USB inputs
  • 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:  20 Hz - 20 kHz
Connection Type/Input:  RCA, USB
Connection Type/Output:  Binding Posts


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