I had no problem with volume on my aleph 3 + Confidence 3 combo -- just a sharp drop off in bass response below 100hz. This was a problem in 3 different listening rooms of different dimensions from small to large in three different houses. The problem may have been the speakers, may have been some bass-dampening phenomenon common to each room -- or it may have been an under-powered amp.
The sound I did get was astonishingly beautiful, though.