Following advice I adjusted the gain dial on my sub and ran auto cal until it read 0.0db in the avr's sw level. This was ok for all but freeview where the auto standby was putting the sub to sleep too soon. As suggested I then turned down the subs gain dial and ran auto cal again to compensate, before testing freeview (news/football) at a resonable vol. After repeating this carefully the sub stays on for 20 mins without bass signal as advertised. It's dial is now at just above the 9 o clock position and my avr sub lvl is on +10 which is it's highest setting. Although the sub now stays on and is balanced with the other speaker levels, is there any harm in the avr's sub level being left at +10?