Let us just test the capabilities of a RGSW3 subwoofer amplifier. Here is an American '1600Watt' subwoofer voicecoil with an impedance of 6.2 Ohms.

Ohms law states that if we apply a voltage of 49.8VRMS to this impedance the power dissapation is 400watts (1/4 of the suggested 1600Watt power handling!!!)

In less than 1 minute, the voicecoil has heated to slight discolouration and light smoke is rising.....

A minute later the voicecoil is 'belching' smoke and is noticably blackened in the center - (this is a USA Driver rated at 1600Watts - just imagine what would happen to a cheap Chinese driver of 300 watts!!!!!)

After 5 minutes the coil is pouring smoke - it is even enough to show up in the photograph!! - and the voicecoil former is blistering. This woofer would not be usable any longer - this is at 1/4 of its power rating!

Voicecoil temperature after 5mins is 269c - definitely not healthy!! - and the Current required to cause this much damage? - merely 8amps - 49.8/6.2=8.03 - so why do we need continuous output currents greater that 8 amps??????

8 amps Continuous Current totally destroyed this 1600Watt driver in less that 5 minutes using a standard REDGUM RGSW3 amplifier - the RGSW3 still operates perfectly and only reached 44c on the heatsink!!!!!