Thank you guys for clearing things up for me, I really appreciate it.
Now I understand, it seems to be true what you said about specifications, my Parasound A52 was benched in a review and it was capable of doing 175W per channel in stereo with 8 Ohms, and 160W all channels driven 8 Ohm , within all the THD, and other specs, although it is only said to be able to produce 125W into 8 Ohms, and 225 into 4 Ohms.
So, as you said, 160 watts + 40% is around 225W.
This means, driving an F52 with 6 Ohm impedance, my amp is capable of doing around 190-200 Watts, all channels driven, and even more in 2 Channel, right!?
Thanks again, today once again I have learnt something.