The Rolls SX95 is a true stereo sub woofer crossover. It also features a mono or stereo selection switch to utilize the SX95 in mono. The SX95 features a true pass thru output that will allow proper connection to your system without any alterations to the original signal. The SX95 is a perfect way to separate low frequencies from line level program material in any system, home, professional or an installation. With a frequency range of 36Hz to 200Hz, and an external power supply for noise reduction the SX95 will allow you to have complete control of you subs.