2-Way Stereo/3-Way Mono Frequency Crossover with Subwoofer Out Like the CX3400, the CX2310 offers absolute precision, state-of-the-art circuitry, professional components, ultra low-noise op amps, fully balanced in and outputs and intuitive operation. In addition to full-fledged 2-way stereo/3-way mono operation, the CX2310 features a separately adjustable subwoofer output, giving you an extra low-frequency band.