Thanks Mr. Andrew T,

Just your calculation, 98vpk for 1200 watts, V x V/r=w ; 98 x 98/4 = 9604/4= 2401, I am sorry but is that correct?

Q. Why it is only voltage which is considered for output wattage, Don't we have any role of current for output, Is the Ohm's Law W= V x I is wrong.

1200/98 = 12.2 amps. okay, 1200/50 = 24 amps. It is true that output impedance will go low for high current Amp.

What people around me needs is an Amp which can work on extreme low impedance load,say down to 0.5 ohm's, and Amps I have made are serving that purpose.

Off course I always use High current Transformers, assuming losses for a 1000 watts Amp I always use around 2000 watts Transformer. so the supply voltage won't drop too much during full load. my 70+ - volt rails gives 66 volts+ - even during full load,

And I am happily using this short of amps without problem in Live programes since long.