i have a four channel amp and it can be bridged to 2 channel and to a mono channel.
well i dont know what the rms wattage is for the mono channel so far i know from the manual that the rms wattage for the 4 channel is 4x80watts and the 2 channel is 2x180watts so can anyone tell me what the rms would be for the mono channel????????

Probably around 360 watts RMS in Mono

What amp do you have. Most 4 channel amps will let you have four channels, 3, & 2 channels. So if that is the case that will change you mono channel output.

i have a kenwood 4 channel amp model kac-744. and its 4 channel 2 channel and 1 channel.