You guys are making the bridging to difficult. On the back of the amp
is a panel in the center. Search for the 2 small holes in the back
labled "clipping eliminator" and "bridged mono (push)". If these
functions are enabled, they will be more "sunken in". To enable
bridge mono: 1.)Turn off amp. 2.)Make sure the source you want
amplified is plugged into the "left" input. 3.) Hook up the speaker
to the "left" channel output. 4.)Make sure the "bridged mono (push)"
button is pushed in (if you want it bridged.) 5.) turn on the amp
and enjoy! I would recommend turning the clip eliminator on, it will
protect both the amp and speaker(s) druing a concert or loud music,
whatever.

Ross