Precision Power PAR-650 is another choice .....
here's the info :
Born of the rich heritage of state of the art, competition-grade processors PrecisionPower has always been noted for, the PAR-650 is a semi-parametric ("paragraphic") 5-band equalizer that allows for easy sound adjustment. With variable equalizer frequencies and a variable 2-way crossover, you can master the sound of even the most elaborate multi-amp system. Dual rear inputs, plus a front 3.5mm mini-jack input, allow this EQ to serve as a convenient source selector. The built-in live drivers give your main amplifiers a healthy 6 volts of clean signal and your sub amp a whopping 10 volts of bass fury! When you're not tweaking, the rotary controls can be pushed back into the unit for a flush look. All in all, an advanced offering of signal processing that is "Absolutely State of the Art." Includes installation hardware and 1/2-DIN trim ring.
Features
Pop-out dual-function rotary knobs
5-band equalizer control
Variable EQ band frequency
Variable low-pass subwoofer crossover with level control
Variable high-pass front & rear crossover
Front/rear fader
Dual RCA inputs & front 3.5mm auxiliary input
Adjustable input sensitivity
6-volt front/rear & 10-volt subwoofer output line driver
Blue LED backlight
Includes in-dash trim ring
Specifications
Frequency Response: 20-60,000 Hz
Signal-To-Noise (S/N) Ratio: 100 dB
Total Harmonic Distortion (THD): 0.005%
Output Level: 6 volts RMS front/rear, 10 volts RMS subwoofer
Dimensions: 7" W x 5" D x 1" H (half-DIN)
Shipping Weight: 3 lbs
Warranty: 1 year