In general I am not a fan of passive tone stacks, much prefering active EQ sections. However, similar to the AD200, the TB sounds so good at close to flat settings, the EQ can stay where it is almost all the time.
I also wonder if the Orange 500 watt class D is perhaps under specified and delivers more than some other amps advertised as 500 watts? It wouldn't surprise me as Orange designed this unit specifically for bass amps.
I wonder if the 500 watt class D power amps are the same in these two heads? The Terror Bass v2 is Orange proprietary design using through hole ( i.e., no SMT) technology. I was surprised to see that when I opened mine (top photo), but it may make repairs slightly easier for techs without SMT capabilities.
I'd remove the front grill and very gently and evenly push the cone inwards a few mm. If you feel/hear it scraping then the voice coil is likely damaged. You can also look more easily for tears in the cone and surround.
Removing the driver from the combo will allow you to see the Turbosound part number on its rear label.
Replacing the driver is a very simple job.