Thanks for the response. I am still questioning which would provide better protection, and the fast/slow blow fuse comment has be a bit confused.
If I use the RMS limiting am I 'matching' the cab's rated power? For example, the 722's are rated at 1200/2400/4800 (RMS/program/peak). JBL recommends power at program levels. Various amp selector tools say to give this cab 2400 watts.
So, am I safe with the following for the 722?
Setting the RMS limiter on the amp to 2400 watts
Set up proper gain stage between the board and drive rack 260
Set the Driverack's limiters to not clip the power amp? (again, assuming that no clipping is happening up stream)
Using the dBu limiter on the amp and drive rack:
Driver Watts = 1200
Driver Ohms = 4
Driver Volts = 69.28203 Calc: SQRT(1200 * 4)
Driver dBu = 39.02638 Calc: 20*LOG10(69.3/0.775)
Amp Watts = 3500
Amp Ohms = 4
Amp Volts = 118.3216
Amp dBu = 43.67525
Driver dBu - Amp dBu = 39.02638 - 43.67525 = -4.64887 dBu LIMITER SETTING
Amp fixed gain in dBu = 37.9
Drive Rack Limiter setting: 1.234 dBu Limiter threshold setting (Driver dBu - Amp fixed gain dBu)