The XTHUNDER125.4 utilizes class A/B amplifier topology to deliver the highest sound quality possible. Capable of delivering 125W RMS power per channel into a 2Ω load, the XTHUNDER125.4 is ideally suited to power MTX Signature Series and THUNDER series speakers.

Using high end materials and a dedication to precision workmanship, the XTHUNDER Series deliver exceptional sound quality and performance.

Built To Drive Powerful Speaker Systems

The unit features a dual sided circuit board wiith increased copper traces that maximize electrical transfer and minimize power lost before it gets to your speakers. The surface mount technology, is incredibly durable and vibration resistant, allowing them to be damage resistant even when deployed in big systems. The entire top cover functions as a heat sink with a lot of surface area to effectively dissipate heat so that it can play louder and longer. The top cover includes removable side covers that allow for easy access to connections and settings even after installation.

The feature set on the XTHUNDER125.4 is loaded and enables full customization to ensure the best possible sound quality without distortion. Customization includes variable high and low pass filters and the unit can be connected using either high or low level connectors.


Class A/B Topology Delivers Excellent Sound Quality
Low Profile Design Allows for Installation Anywhere
Cast Aluminum Top Cover Efficiently Dissipates Heat
Variable High Pass Crossover
Variable Butterworth Crossover 12dB/Oct
Fixed Bass Boost Is Ideal for Use with Subwoofers
Thermal, DC Offset, and Short Circuit Protection Circuitry

Tech Specs

4 Ohm RMS Power Output 90 Watts x 4
Signal to Noise Ratio >70dB
2 Ohm RMS Power Output 125 Watts x 4
THD <0.2%
Frequency Response 20Hz – 20kHz
4Ω Bridged 250 Watts x 2
Maximum Input Signal 5V
Max Sensitivity 100mV
High Pass Filter Variable, 40Hz – 250Hz, 12dB/Oct Front/Rear
Bass Boost 12dB @ 45Hz
Topology Class A/B
Depth 8.9″ (226.7mm)
Length 14.2″ (359.9mm)
Height 2.03″ (51.5mm)