The FDS-310 is a 2-way stereo or 3-way mono, sweepable crossover system built around our high quality 24dB/octave Linkwitz-Riley filters. Each frequency band has its own level control, frequency control, polarity reverse, mute button, signal present LED and peak signal warning LED. Internal "jumper" facilities include constant-directivity horn EQ, mono low linking. Frequency range in the 2-way stereo mode is 180Hz-2kHz, and in the 3-way mono mode is 180Hz-2kHz for low-mid range, and 800Hz-9kHz for mid-high range. It has internal jumpers to change all frequency ranges down in divisions of 10. Inputs and outputs are electronically balanced with both XLR and 1/4" TRS connectors.