Alpine PDX-F4 4/3/2 Power Density Digital Amplifier
This amp is awesome!!  It replaced another Alpine that I had for 6 years.  Amp is mated to Infinity Kappa component speakers in front and 6x9's in the rear.  I liked my old amp, but this amp is so much better.  The sound quality/clarity is superb.  The HP & LP filters seem to work better as well.  The modular connectors are a big plus-just attach the wires to the appropriate connector and then plug in the connector.