Originally Posted by tojo_m
Any ideas how to add some good thump to the base audio system (US) in the F30?
Also does the stock system come with any frequency crossover system to pass just the lower frequencies to the two 8" subs (located below the seats) and the rest of the frequencies to the other speakers?
I'm pretty sure they're crossed over from the factory. It seems logical for a system with dedicated subs and tweeters to not have the wrong frequencies going to either, I'd think having those low signals going to the tweeters would blow them pretty fast and lower the overall quality of the system at worst. (but i havent really looked into it to be honest)