AudioControl DQ-61 - Digital Signal Processor

You want good sound in your vehicle but you can't (or won't) change out the factory receiver. Audio Control's DQ-61 6-channel digital processor hooks up to your vehicle's speaker wiring, and transforms your factory radio's output into a balanced, equalized, and time-aligned signal that'll get superior performance from your aftermarket amps and speakers. And the DQ-61 will work with just about any factory setup, even amplified systems.
You need a lot of tone control to achieve high-quality sound in the quirky acoustics of the mobile environment. With seven bands of equalization on each pair of front, rear, and subwoofer channels, the DQ-61 can tune the complete audio spectrum almost to perfection. Its Signal Delay function centers the musical image so it sounds balanced at about windshield height, instead of down around your left knee. An included wired remote lets you make adjustments and control the sub level from your front seat.
Many factory radios turn the bass down as the volume increases, protecting the vehicle's cheap factory speakers, but losing low-end power and punch. AudioControl developed a patent pending AccuBASS circuit that restores the bass the factory system erased, giving you much fuller and more enjoyable sound. The AccuBASS works on the DQ-61's subwoofer output channel, so your sub amp can work with a totally restored bass signal.