[soundman98]

I just rechecked my old '14 rear speakers, and there aren't any visible components on the rear speakers to indicate they get anything other than a full range signal. I believe the professional term is 'acoustic crossover.'

No one's really put effort into understanding the factory amp because it largely doesn't matter. There's no adjustment in the factory equipment, so there's no need to dig into how it does what it does so poorly.