You got to get the polarity correct for the input power. Doesn't matter for the driver.
+ is positive.
- is negative.
Are you referring to the point where AC mains must feed, or is do you have a power supply.
If the marking are +ve and -ve, then it is either the speaker output or a DC power input.
The last thing you want to do is put AC mains into the speaker outputs.
If it's an AC input, polarity is not applicable. But then it wouldn't be marked + / -.