Bring your in-car audio to life The XM-GS4 4-channel amplifier is engineered to enhance every trackincluding High-Resolution Audio filesthanks to an ultra-wide frequency range that extends up to 100 kHz. A range of premium circuit components work together for ultimate efficiency and pitch-perfect sound reproduction, so you can give every road trip the soundtrack it deserves. Premium circuitry for optimum performance Get the best from your in-car sound, thanks to the XM-GS4's hub of high-quality audio circuitry. Everything is engineered for minimal noise and maximum efficiency including the heavy-duty aluminum casing, which keeps things stable for low distortion. Supercharge your favorite songs with this 4-channel amp Enjoy 70 W of power from each of four separate channels, for more flexibility in setting up your ideal in-car sound stage. Using a bi-amplification connection, you can assign two channels to bass frequencies and two to high frequencies, minimizing distortion. You can also independently adjust the volume of different frequencies to find the perfect balance for each song. Combine our premium components for unrivaled acoustics Take your in-car sound further. Our premium on-road audio products are all designed to complement each other, so you can build the perfect audio soundscape for your car. Choose from multiple mounting options The XM-GS4 can be positioned in a number of different places throughout the car. Install it in the front for easy access to controls, or put it in the boot to save on space. RSX-GS9 media receiver Get the ultimate in-car audio experience, with the world's first receiver5 to boast DSD native playback. XS-GS1 component super tweeters Enjoy supreme ultra-highs from these innovative front-facing super tweeters.