The door mids won't give you meaningful output below about 200. The woofers under the seat CAN give you good output down to about 50. Sub-bass starts at 50 (and most FM stations don't broadcast signals below 50).
So bass is from 300-20. The 8" size can do a really good job without a trunk sub. But if you want to play really loud, or play a lot of Rap/hip-hop or techno/electronica loud, you may need a trunk sub.
If you run your bass way high, all the time, you need some kind of upgrade.
I haven't had my trunk sub in my car for months. But I'm 45...
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