Speaker polarity in guitar amps

[Hamilton]

Over the years I have seen many Fender amps with "D" series speakers wired incorrectly (black wire to black terminal), which I believe is wrong. The ¼"phone plug tip white wire should go to the black speaker terminal. Correct?

Is amp-to-speaker polarity even important in guitar amps?

Thanks.

[Allanvh5150]

In single speaker applications it would make no difference. Different story in duo's and quads etc.

Allan.