Nakamichi NDS 6120 DSP / audio processor 

a quick look at the Nakamich 12 channel DSP.
I've used this unit in my little Street Pounder for some time and it served me really well.
After Upgrading to Sony's new XAV 9500ES head unit, which is a High Resolution unit, I opted to upgrade the DSP to something that could handle the higher bit rate.