Alpine X-A90M X Series Mono Power Density Amplifier CTA-2006 Power Rating: 900W RMS x 1 (2Ω, <1%THD+N, 14.4V) 600W RMS x 1 (4Ω, <1%THD+N, 14.4V) S/N:90dBA (Reference: 1W to 4Ω) Pine Function Matsumatsu ID Sound Quality Class s-D Performance Rotatable Illuminated Alpine Badge Top-Side Control Panel Built Crossover & Bass EQ Remote Bass (RUX-KNOB or RUX-KNOB.2) Compatible criticAL EVALUATION OF IN-CAR SOUND Alpine top engineers from around the world are gathered at Alpine headquarters to research and evaluate sound systems from aftermarket. Premium OE Manufacturer Many systems today have an amazing dynamic range that reaches enough volume levels, but lack the reality of instruments and spatial imaging. The result is an Alpine ID, a sound philosophy that continues to stimulate us to create a new level of sonic performance. ALPINE: IMAGE DEFINED or abbreviated Alpine ID is a new alpine global sound culture with an advanced approach to solving anything lacking in most modern car audio systems. Great space imaging and sound stage depth It focuses on developing a matching sound system with core components to achieve realism at sound stage while maintaining excellent dynamic range and accuracy. The core of the X-Series Amplifier chassis is a heavy duty cast aluminum heatsink that keeps the amplifier cool when performing at peak power levels. Excess heat is removed from the amplifier through a newly designed heatsink profile, which improves airflow and increases surface cooling area. Fanless channels located on both sides of the amplifier allow for air convection; hot air will naturally rise from the top of the amplifier and cause the vacuum to breathe cold air from below. This smart design provides continuous heat control for uninterrupted listening experience.