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Alpine X-A90M Mono Power Density Amplifier

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  • Class-D Performance
  • Top-Side Control Panel
  • Built-in Crossover & Bass EQ
  • Remote Bass (RUX-KNOB or RUX-KNOB.2) Compatible

Alpine X-A90M

Mono Power Density Amplifier

Revolutionizing How Your Music Feels
Hear and feel the music like you never have before with X-Series Amplifiers.


  • Alpine ID Sound Quality
  • Class-D Performance
  • Rotatable Illuminated Alpine Badge
  • Top-Side Control Panel
  • Built-in Crossover & Bass EQ
  • Remote Bass (RUX-KNOB or RUX-KNOB.2) Compatible

Critical Evaluation Of In-Car Sound
Alpine’s top engineers from all over the world gathered in Alpine headquarters to deeply research and evaluate sound systems from both the aftermarket and high-end OE manufacturers. Many systems today have incredible dynamic range and reach sufficient volume levels, but lacked the reality of instruments and spatial imaging. As a result, Alpine ID was born, a sound philosophy that continues to inspire us to create a new level of sonic performance.

Alpine: Image Defined
Or Alpine ID for short, is the new Alpine global sound culture with an evolutionary approach for solving what’s missing in most car audio systems these days: great spatial imaging and depth of sound stage. It centers on developing matched sound systems with core components that work together to achieve greater realism in the sound stage while maintaining great dynamic range and accuracy.

High Performance While Retaining Class-Leading Power Density
X-Series amplifiers are built on a new Alpine-proprietary circuit design that achieves class-leading power density and reliability while performing at the top of its class. By simplifying the circuit topology, Alpine is able to ensure the cleanest possible signal path. While the simplicity of the circuit contributes to a great sounding signal, we added an exclusive dual feedback loop that corrects signal distortion. This clever design results in a frequency response that not only meets the Hi-Rez audio standard of 40kHz but even extends up to 60kHz. The amp maintains a very low phase shift throughout the music spectrum which allows your music stay faithful to the original recording with realism that puts you in the center of the performance.

Keeping The Heat Down While Faithfully Reproducing Music
At the core of the X-Series Amplifier’s chassis is a solid cast aluminum heat sink which keeps the amplifier cool when performing at its peak power levels. Excess heat is removed from the amplifier through the newly designed heat sink profile which both improves airflow and increases surface cooling area. The fan-less channels located on both sides of the amp allow for convection flow of air; hot air naturally rises out from the top of the amplifier, which causes a vacuum that sucks in cool air from below. This smart design allows for continuous thermal control for an uninterrupted listening experience.

Proven Power
X-Series Amplifiers come with their very own birth sheet which reveals each amplifier’s true power rating.


  • Power at 4 ohms 600x1
  • Power at 2 ohms 900x1
  • Width 11 3/4"
  • Height 2"
  • Depth 7 5/8"

Return Policy

30 Day No Hassle Returns

Installation Guarantee

Lifetime guarantee on installation


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More Information
Product Name Alpine X-A90M Mono Power Density Amplifier
Manufacturer Alpine
Manufacturer's Warranty 1 Year Manufacture's Warranty
Manufacture's Warranty 2 N/A
UPC 793276040565
Manufacturer Sku X-A90M
Amplifier Channels Mono Block
RMS Power Output (Watts x Channels) 600 x 1
Power at 2 Ohms (Watts x Channels) 900 x 1
Bridged Power (Watts x Channels) N/A
Minimum Impedance Unbridged 2 Ohm
Signal to Noise Ratio @ Rated Power 83dB
Amplifier Class Class D
Low-Pass Crossover Frequency 50-400Hz
High-Pass Crossover Frequency N/A
Bass/Gain Remote Yes/Optional