On the back of the Behringer 1124 there is an operating level button with the option of +4db or -10db. It is recommended for the 1124 to operate at -10db. Sounds like this could be your problem. If you have this option, make sure it is set to -10db.
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Sony HS51 PJ
Outlaw 990 pre/pro
Outlaw 7100 amp
Denon DVD-2910
M&K LCR750
M&K Surround-55 tripole
Dual M&K VX-1250
Outlaw PCAs
Blue Jeans Component and HDMI
Panamax 5500