they apply to both i believe, i know its true with my HU. the HU xover overrides my external amp xover, so i leave it off on my HU. he can try crossing it over at 100hz.
accually if the HU xo is 12db and the amp xo is 12db than you would just have a 24 db slope.they apply to both i believe, i know its true with my HU. the HU xover overrides my external amp xover, so i leave it off on my HU. he can try crossing it over at 100hz.