Can you connect a high voltage amplifier to the hybrid battery?

only if you want to see magic smoke...

 

Can you supply us with the input power specs for those amps?

We could probably all duplicate the work of googling it, but as it's your question, after all....

 

If the application is something like: the Prius is a rolling amplifier that you bring to a venue for a gig and park and attach to speakers ...

The max musical consumption of 91.5 A is within the fuse rating of the battery. It would fully discharge the battery in a few minutes, so the car would have to be in READY mode to keep it charged.

91.5 A at nominal 201.6 V is about 18 kW.

The car's powertrain can easily produce 18 kW, but it won't when it's just sitting parked and READY. A gen 3 liftback will generate about 3 kW in that condition (as determined by Randy Bryan, who has offered high-input-voltage inverters for using a Prius to supply home loads).

By holding the brake and go pedal, you can force a charge mode that may produce more than 3 kW.

You would want an OBD-II device to monitor the MG and electronics and battery temperatures, at least at first.

 

Hate to ask a question that was an original question on your post but how many drivers and size of
subwoofer box can you possibly fit in a turd gen Prius that will take up 40,000 watts? I have a 5 cubic Ft sub box and can only see thru the top half
Of the hatch back window, good thing mine has a rear back up
Cam.

An 18” sub will need the entire hatch area to be boxed for best sound. A pair of 18s will need the backseats removed and the subs boxes will have to be built all the way to the back of the front seats.

There’s not enough cabin space to build an effective and efficient sub box for 40,000 Watts let alone 10,000 Watts. You want a big suv to reap the best of a 40,000 watt capable amp