I build/built speakers. I listen to music, loudly. Not in my car though. You'll notice the lack of a "system" in my car. I had (past tense) one in my neon and it sounded good. Go figure.
This is one of my Dayton Budget Projects. I used the first crossover and added BSC later. I like them. They look scratched up in these pictures. I repainted them afterward. Satin black of course. I use them in my garage now. I like them.
These are speakers I built for my garage. I used the Foster 5.25" on Madisounds sale page for $4.50 ($3 now, no longer available). I didn't like the first one that was fullrange-ish for my purposes. The second one (it has 463 in the number i think) had a steep roll-off at 6000 or 7000hz, so it runs unfiltered. For the tweeter i used an Onkyo mylar dome that was (is) 20 cents on Parts Express buyout page. It already has a cap on it (5.6uf i think). I didn't pad the tweeters at all. These are no longer my garage speakers.
I used winISD beta to figure out box size. I chose 6 liters sealed or thereabouts. There was a huge spike centered around 120ish I think. It wasn't going away so I just threw this box size at them. Along with the unpadded tweeter and minimalist crossover, these are very commercial speakers. The cabinets are made from .625" particle board i saved from a bookshelf. The baffle is .75" MDF for reasons of convenience. I cut the top and bottom edges of the sides oversize and used a flush trim bit. The front and rear had all sides oversize and cut flush. I put a roundover on the baffle. I used glue and 18AWG brads. No braces or screws. Woofer cutout was done with a Sears router jig ($20) and a Craftsman router, surface mount.
These are my vented TMM 2.5 ways. They use Dayton DA175's i bought on DOTW and HiVi K1 tweeters. These were designed and executed by Pete Schumacher and Rudy Jakubin. Thanks guys. I like these a lot. There are quite a few different versions out there. I think one with 6 DA175's would be nice. That'd be quite a big cabinet though.
I've also built a pair of Zaph's B3S. They are (were) my computer speakers and sound fantastic. I also built a pair of Microbes, Wayne's Tiny Line's with HiVi B3N's, A Cerebrus sub with removable baffles so i can interchange the Tang Band with a Dayton 8 DVC. The Microbes, Cerebrus, SA70 plate amp and a T-amp are used on my computer.