Hi andrew, regarding your advice about putting my power amp on top of the pre-amp, having looked at the two, it seems that the power amp,s heat vents are on it,s belly, therefore if placed on top of pre then it would get more heat to deal with, do you think i should keep the pre on top. Can,t put side by side, have to stack, also on top of each unit are dimples at corners for each component to fit into. Thanks john.