I've tried that in the past and it was scary, it was way worst . But instead of relying on my memory I will redo a test tonight with an audio cd.

Is there something I could have done wrong?

My receiver : http://www.yamaha.ca/av/Receivers/RX_V650Ti.jsp

all speakers are set to small

and are configure like this
FL: +6.5db
C: +7db
FR: +6
RL: +9db (due to odd speaker placement)
RR: +9db (due to odd speaker placement)