Kicker's Front Row digital signal processor puts your music where it should be right up in front of you. A wired remote control panel lets you center the music to your listening position, add bass, and engage a simulated 5.1 Surround Sound that makes it seem like you're at a concert.

AudioControl's FOUR.1i equalizer takes the old-school in-dash EQ to a whole new level. This little problem solver features 4-band equalization, a parametric bass equalizer, and a built-in line driver that'll send a hot, clean signal to your amps.

AudioControl's LCQ-1 six-channel signal processor lets you bridge the gap between your factory stereo and the high performance power of aftermarket amplifiers, speakers, and subs.

AudioControl's LCQ-1 six-channel signal processor lets you bridge the gap between your factory stereo and the high performance power of aftermarket amplifiers, speakers, and subs.

Kicker's KQ30 30-band equalizer will help make your music sound awesome in your car. Let's face it, your vehicle's interior is not the best place for listening. The limited and uneven space, echo-producing windows, and loud road noise combine to create "hot spots" that hurt your ears and dead zones.

AudioControl DQDX features a 24 dB/octave Linkwitz-Riley alignment crossover. This sophisticated crossover offers a flat response without any peak or dip around the crossover frequency and avoids the phase irregularities of lesser crossovers.

AudioControl DQDX features a 24 dB/octave Linkwitz-Riley alignment crossover. This sophisticated crossover offers a flat response without any peak or dip around the crossover frequency and avoids the phase irregularities of lesser crossovers.

Rockford Fosgate built their 3Sixty.3 processor so you can enjoy amazing sound quality from your vehicle's sound system — the quality you'd expect from a high-fidelity home stereo system or a pair of really good headphones.

Alpine built the PXA-H800 digital sound processor for one purpose: to deliver pristine sound to aftermarket amps, speakers, and subs. It takes control over your sound before you send it to an amplifier, stripping away hard-coded factory settings and starting from scratch.

The PDR-V75 can put out 75 watts RMS per channel to your four full-range speakers, plus up to 350 watts RMS to a subwoofer. You can also use this versatile amp in 3-channel mode, driving a pair of high-performance speakers with 200 watts each, while still sending 350 watts RMS to a sub.