anyone know the wattage

does anyone know the peak power on the old mtx blue thunders....the black cone with the blue writting? i got bored and decided to run my alpine mrv 1507 to it 4 ohm mono at full gain just to see how long it will take to melt the vc. i just want to figure out how long that will be.

I had a 10" blue thunder hooked up to an Alpine V12. 4 channel (bridged first two channels) I think 400 watts.