**Brand New, never used, items are still sealed" I originally bought this new from an authorized alpine dealer.

The Alpine PXA-H800 is an advanced 8-channel system integration digital sound processor (DSP) designed to drastically improve in-car audio quality. It allows audiophiles to finely tune sound systems, add true 5.1-channel surround sound, and seamlessly integrate aftermarket amplifiers with either factory or aftermarket head units