Some 1070 users out there with separate amps can hopefully give you some feedback about the 1070 specifically, but in the meanwhile I can comment on what my old 1050 did when a separate amp was added. The unit still generated a fair bit of heat from the amp section (which is basically sitting idle), but there may have been a few degrees difference. Of course, my separate amp was beneath my receiver when I had the 1050, so heat from the amp would have risen past the receiver.