From the seller:

Peakx PlusTM Limiters provide the ultimate in system performance and protection by allowing full control over threshold, attack, and release Enhanced Subharmonic Synth section provides user control over frequency, gain and filter type for system-specific tuning 3 user-defined fan mode controls -normal, early and full- speed -for matching fan performance to a specific application New system monitoring provides software visibility of AC line voltage and power supply temperature 4 Stereo (per channel) 800W Crown’s XTi family of amplifiers defines the standard for portable PA systems with unmatched performance, technology and power-to-the-people affordability that delivers the goods night after night without even breaking a sweat. There’s no debate — when you choose Crown’s XTi Series, you’re choosing one of the most powerful and efficient amplifiers on the market today. How do we do it? With innovations designed to simplify your life and rock their world. Innovations like integrated DSP that allows you to quickly and easily configure crossovers, EQ, limiting and delay, along with tools like a pink noise generator, subharmonic synthesizer, and universal tracking switch-mode power supply, which reduces power draw and waste heat. And as the first Crown amps to use Icepak thermal modeling software, they are at the top of their class when it comes to thermal efficiency and lightweight portability. The XTi Series demands respect without making demands on you. With this kind of freedom and reliability, the XTi family is one you’ll always want to be a part of. XTi. The power to move you — and the world