Bheringer DSP 8024 real-time analyzer/parametric equalizer/feedback destroyer, MIDI. This unit has stereo analog inputs and outputs and MIDI inputs and outputs. It does not have digital inputs or outputs. Insert this between your preamp outputs and power amp inputs for full, automatic equalization of your system based on RTA of your system's output, using supplied, calibrated omni directional condenser microphone. I did not use this to equalize my entire system, but fed it from my integrated amp's pre outputs into the high-level input of my subwoofer. While I don't recommend this in an effort to boost your sub's bass extension, what this does do is adjust the bass drive for flat response in your room, most importantly, compensating for the 6 dB or higher room resonance between 40 and 50 Hz. This reduces or eliminates the room boom that is the problem with putting a lot of low bass drive into the typical listening room. The calibration process is automatic; the unit generates a pink noise signal and then uses the parametric equalizer to adjust output to conform to a flat curve, or whatever custom curve you specify. Includes unit, manual, microphone in its own case and 20 foot microphone cable. (is not controlled by a remote.) My new location has less room for equipment, so this has to be sold. Works fine.