Enlightened Audio Design (EAD) made some of the best sounding 5.1 processors. When used as a 2-channel audio preamp, the results were more than satisfactory. These units sound so good in both 5.1 and 2-channel; that many people who own these units find that CD playback sounds better when using their CD players digital out and use the internal DAC in their EAD processor for their 2-channel playback. Back in the day when I used a Cal Audio Alpha tubed DAC, I can confirm this.
The models that Im referring to are the Encore, Ovation, Ovation Plus and Signature models. All were available in Silver or Black. Current prices range between $800 and $2000. I'm guessing that original list for these units were between $3.5K and $8K. Build quality was excellent. EAD offered an aftermarket upgrade to these units adding an analog pass through along with other improvements. From what Ive hear from owner who had this done, most were not happy with the sonic results. Id stay away from these units.
I personally own a TheaterMaster Classic which was EADs soul processor prior to the above mentioned product line. My dedicated 2-channel pre is a Jeff Rowland with separate power supply. When comparing the two units, the results are too close.