the difference between MR816CSX and MR816X:

MR816 CSX offers Onboard DSP for eight Sweet Spot Morphing Channel Strips, but MR816X doesn't.

Full Comparison of MR816CSX and MR816X(PDF download)

Functioning far beyond the envelope of traditional audio devices, MR816 CSX and MR816 X fuse a fully-featured FireWire interface and inbuilt DSP FX power with next-generation integrative technologies into one breathtakingly powerful production environment. This Advanced Integration DSP Studio is the hardware centerpiece in a latency-free recording and monitoring environment that fully exploits the flexibility and power of Steinberg's renowned Cubase Music Production System.

• True Integrated Monitoring-: no latency, DSP-powered FX and full Cubase Control Room support including independent Studio mixes
• Complete Cubase user interface integration throughout: direct access from Cubase with no additional software mixing or external windows required
• 8 discrete Class A analog 'D-Pre' mic preamps with combination XLR and TRS analog inputs with advanced new inverted Darlington circuits and switchable phantom power per channel, as well as digital ADAT I/O and S/PDIF I/O
• Quick connect: Dynamic 1:1 hardware/software mirroring and next-generation of plug and play with instant routing of inputs to Cubase channels from the hardware with the push of a button
• DSP power for Cubase*: Up to 8 simultaneous onboard DSP-powered Sweet Spot Morphing Channel Strip with compressor, EQ as well as REV-X reverb - available within Cubase during mixing 
• Includes Cubase AI software
  

Front Panel View

Rear Panel View

1. Power adaptor DC in
2. S/PDIF and ADAT in and out
3. FireWire sockets
4. WordClock in and out as BNC
5. Analog outs as TRS
6. Combo TRS and XLR inputs
7. TRS stereo inserts