The dspNexus is the control center of your system. It connects to the sources you care about.
  Balanced Analog Stereo
  Input USB Audio Class 2
  S/PDIF
  Phono input with Digital RIAA
  Digital sources come in all sorts of sample rates and levels. The dspNexus automatically up-samples to either 192k or 384k,
  performs jitter attenuation, and remembers the volume settings for each source independently
 DSP Processing on Steroids... dspNexus is powered by an Analog Devices SHARC DSP, the gold standard of audio DSPs. The DSP is the brain of the system. It performs these functions: Active Crossovers Sample Rate Conversation and Jitter Attenuation Room Correction and Bass Management IIR & FIR filtering Time Alignment in 5uS increments Digital RIAA for Vinyl Reproduction
At some point, it needs to return to analog....
All the clever DSP processing, attention to detail, and convenience is irrelevant if we don't get the DACs right. So we don't compromise. The dspNexus uses state of the art "Velvet Sound" DACs from AKM. If we thought there were better DACs, we would use them instead. We surround these devices with Class A anti-imaging filters and 3dB stepped attenuators. Regardless, of how you use a dspNexus, you will have at the very least, a no-compromise playback DAC..AKM 4493 and AKM 4499 ex
Do you want to listen with headphones?
The dspNexus has a headphone amplifier.
The headphone settings are independent of the loudspeaker settings so that level and filtering are appropriate for each situation
Want to make measurements? There is a 48V phantom-powered microphone input and a measurement ADC built into the dspNexus.
Each measurement is also referenced to any one of the DACs so that you can make calculated time delays from each driver.
If you have a bank of external amplifiers, you can place them all on standby or mute when the system is not playing 
What about a new improved dspNexus?....
Well, we did claim that we use the best ADCs and DACs, "Ferrari" like DSP, etc. Someday, this won't be true.
We all know we can only use the best available at a point in time. So here is the good news:
The ADC, DACs, and DSP are all implemented with plug-in modules! If we have a newer, shinier option, you will probably be able to upgrade your dspNexus.
Software upgrades to the DSP and display are all done without opening the box.
What dspNexus is best for me
dspNexus 2/8 The dspNexus 2/8 is a stereo input, eight output version. It's the inspiration for the dspNexus family. 
This is the version you want to create a fully active DSP crossover implementation.
This is not without implications. It means that you are tailoring a loudspeaker design that will not be using passive crossovers and will instead rely on a bank of power amplifiers driving each driver of your loudspeaker individually. The design of the crossover does not take special programming skills,
We supply the dspNexus 2/8 with a licensed version of DSP Concepts' Audio Weaver. This is a graphical design tool that lets you create production quality crossovers tailored to the specific requirements of your target loudspeaker system. We provide training to use this tool effectively or in some cases, can connect you with a crossover specialist to help you.
The dspNexus 2/8 is the path to convert a very good loudspeaker system to a much better loudspeaker system regardless of the initial cost.