The EX4.6 PRO is ideal for perfecting your audio system. PRV Audio's EX4.6 PRO electronic crossover gives you tons of flexibility to make it easy to tune your car audio system for optimum sound. To get maximum power and impact from your system the EX4.6 PRO also includes an 0-12 dB bass boost at 45 Hz on the subwoofer output.
eBay