Current limit onset definition?

No, I don't think so. 90 amps through a 600 watt output section would toast the output devices in a heartbeat. Or less.

The 90 amp figure simply has nothing to do with the output section. It has to do with the power supply.

Ralph,(Atmasphere I think). Why square the 90?
I see nothing about squaring in the power formula.

Why do you say 600 watt output section?

Ptss, the amount of power delivered into a resistive load is:

P = (I squared) x R

where P = power (in watts)
I = current (in amperes)
R = resistance (in ohms)

An alternative formula which produces the same result is:

P = (E squared)/R

where E = voltage (in volts)

Both of those formulas can be mathematically derived from the definition of power (E x I for a resistive load) in combination with Ohm's Law (I = E/R).

Also, the reason Ralph referred to a 600 watt output section is that most of the amplifiers which have been discussed are rated as being able to continuously supply around 600 to 700 watts or so into a 2 ohm load.

Regards,
-- Al

Thx Al. I'll look into this.