Keep swapping the Boulder 866 and the Accuphase E650, and think, with my speakers and cabling, the Accuphase is the better match. Just seems more organic, and goes to show the key to system matching . They are both superb integrateds, an possibly the Directstream DAC is smoother than the boulder one. Now ANOTHER swap is necessary!!..))...And these things are heavy. An embarrassment of riches somedays...Perhaps cable change....