Make your multi-speaker system sound spectacular Alpine's PXE-X121-12EV amplifier and digital processor is a versatile upgrade that'll deliver high-fidelity sound to almost any car audio system, aftermarket or factory. The amp features 12 channels with staggered output power and DSP control to accommodate multi-speaker systems found in many newer vehicles that have a mix of tweeters, small and large midrange drivers, full-range speakers, and subwoofers. For example, this amp can drive four dash-mounted tweeters and small speakers with 25 watts each, six front and rear door component systems and speakers with 50 watts each, and a subwoofer with up to 200 watts from bridged channels 11 and 12. DSP control via Bluetooth® app You can control the PXE-X121-12EV's digital processing wirelessly with your iOS or Android device or wired to a Windows PC via the supplied Bluetooth adapter and USB cable. With the app, you can stream music as well as control the amp without needing a receiver. You download the free Alpine Music App for iOS or Android device from the Apple APP or Google Play Store. The PXE-X121-12EV Pc app for Windows is available from Alpine. Mixing, matching, and stereo placement Matrix mixing allows for the summing and management of all the input and output signals. Fully adjustable high-pass, low-pass, and bandpass filters on every channel match the sound to your speakers. 31-band equalizers help achieve the perfect tone, allowing you to smooth out any hot spots or dips in the frequency response of your vehicle's interior. The delay feature lets you center the stereo image for your listening position. Product highlights: 12-channel car amplifier with digital signal processing 25 watts RMS x 4 + 50 watts RMS x 6 + 100 watts RMS x 2 Hi-Res Audio certified (frequency response: 20 - 40kHz) operating voltage: 9-17V compatible with start-stop vehicle systems DSP adjustments and settings made via Bluetooth device, Windows PC via USB download Alpine Music App for iOS or Android device from the Apple APP or Google Play Store download PXE-X121-12EV Pc app for Windows at Alpine.com Adjustment details: 12-channel 32-bit 300 MHz digital processor 31-band EQ with fine tuning adjustable high-, low-, and band-pass filters (20-20 KHz) selectable filter slopes (12, 18, 24, 30, 36, 42, 48 dB/octave) selectable filter characteristics (Butterworth, Bessel, and Linkwitz-Riley) delay: 0-20 milliseconds (0-273") phase adjustment: 0 or 180° music and nav sound mixing full-range outputs available for larger systems More info: includes Bluetooth adapter and USB cable inputs: 2 RCA preamp, 12 speaker-level, optical and coax digital, USB speaker-level inputs handle up to 10.6V (28W) preamp outputs: 2 RCA wiring and hardware not included with amplifier 8-gauge amp wiring kit with fuse recommended fuse rating: 30A x 2 dimensions: 10.32"W x 2.33"H x 11.3"D warranty: 1 year MFR # PXE-X121-12EV Item # 500PXEX121 California customers: www.P65Warnings.ca.gov What's in the box: 12-Channel amplifier/processor (two installed 30A ATO fuses) 6" 26-Pin Output harness 6" 24-Pin high-level input harness 6" 10-Pin power/ground/remote input harness KCE-800BT Bluetooth module with attached 6" RJ-45 cable 16' USB-A to USB-B cable 2 Mounting brackets Four 3/4" screws