Helix HXPRODSP Pro Digital Signal Processor DSP adjustments and settings made via computer (Windows only) or optional remote control download DSP PC-Tool Software 3.0 from Audiotec Fischer Asahi Kasei A/D converters, Analog Devices D/A converters inputs: 8 RCA preamp, 8 speaker-level, 1 optical SPDIF, 1 coax SPDIF 10 preamp outputs (6 volts RMS)