Need some ideas here getting real frustrated ... think an amp upgrade is a necessity maybe. I have been trying all afternoon to get the levels sorted front to rear and my amp is doing something unexpected that I haven't noticed in the 4 years I have owned it. I can get the fronts balance using pink noise no problem across all three fronts (mains and centre) but then try to increase volume to get the rears to the level of the fronts and reduce the db level of the front three in order balance and the rears go quieter with the mains AAAAAARGH help ! ! if I knock 20db off the fronts the rears stop working altogether!!. What am I doing wrong here - got them balanced OK with the Bose at the front and Eltax HT-2 bipolar rears. I have a pair of Acoustic engergy Aesprit AE309's and a 307 centre at the front, I have two AE300's at the rear (NOT compacts) sitting on Alphason AG-60C filled stands. The amp is a Yamaha DSP-A5. Is this me / the amp / both .... do any amps let you set the rear levels seperately i.e. THX certified systems.