I have that amp, and you can't bridge it, or do you mean strapping the amps together?
Then yes, one the first amp, you plug it into the + side,
on the second amp you plug it into the + side also,
then you have to have a third wire connecting the - side on the first amp and - on the second amp.
The minimum load is 2 Ohms, and you have to set the 180 degree phase on the second amp. Don't forget the bd Sync cable, and setting the first amp to Master and second to Slave.
If you mean bridging a single amp, then you can't, connecting the different sides gets you the same output power.
The A and B channels are only meant to make wiring easier, (i.e. two subwoofers.)
You'll get the same output on both sides.
It's a mono amp, meaning 1 channel.