TPA3116 on 1 ohm load

Not too weird
Id expect the power supply to shut down.
1 ohm is a ton of current.
For a single driver not much benefit.
Power supply is getting hammered.
Switch mode can do current but not
to great at it

Guess the 70's add copy lives on.
Low impedance doesnt give " more power"
it uses more power.
Numbers look good in the add though
 
IF TI suggests 3.2 ohm minimum load for a single 3116 and 1.6 for two in parallel (just read the datasheet), Logic/Math says you need three in parallel for 1 ohm.

Can use just two?
Yes, you can.
You can also drive with the handbrake engaged (I have a couple times).
Simply "not good Engineering"