Before I get out my oscilloscope and check, does anyone know how a
typical AV amp crossover behaves?
That is, when the main speakers are set to small, the sub-out has a
low-pass filter
and the other outputs have high-pass filters, but what order and type?
If implemented digitally, I would expect a high order filter.
I wouldn't know if they all use the same chips and algorithms.

--
Eiron.