Wow! Excellent comments on the now broken-in CD8. Thanks.
It doesn't surprise me at all that the break-in time is over 500 hours. My CD-7 took that long as did the Ref-3. The PH-7 didn't take as long ... but still a good 300 hours to sound it's best.
For those who are finding the ARC gear to be bright, non-musical, tonaly bare or solid state like, I would humbly suggest that you check your power cords and room treatments. Magnan power cords and Shitaki Holograms (2 pair) have transformed my system ... and I thought it was really good before these improvments. Now its great.