This will be kept simple. Follow the KISS method here. 1 MAJOR factor is using head unit at 3/4 volume or having the proper tools to know your head units max volume prior to clipping. Must have bike RUNNING when setting gains.All enhancements, bass,treble etc all set flat. Use a good true rms multimeter. Use the Chart I am providing. Save yourself the headache of the math. It all works the same be it bridged or not. 4 ohm is 4 ohm. 2 ohm is 2 ohm. I am also providing link to test tones. There are others out there but you really only need the 1 khz tone for 99 % of builds on this forum. I advise using the -5 db tone for some gain overlap. Test tones

Here is a JL audio video for a visual example.