just adding my two cents here: when you go to the u-clock page on the dcs website all pictures show the clock under the puccini in a stack. this is unusual to me because i would think stacking would create more vibration than not. the dealer where i first listened to the puccini had the clock on a separate shelf (above), and i would guess separate shelf (above or below) would always be better, provided you have proper ventilation. anyway, for now, i use mine sans clock and hope to get one soon.
@kops, per our email exchange several months ago, you are correct, puccini+jadis is a very nice combination :)
best wishes to all. r