Here's the problem.
The 8500 watt amp is rated at 1400 watts rms. They don't tell you into what impedance so who knows what it actually can put out. They also say it's bridgeable which a monoblock amp can't be. You need two channels to bridge an amp. The woofer power rating is probably pretty much a fantasy too.
If you an reach someone at the company that makes or imports the brand they may have someone there that can honestly tell you.