Conclusion: The Apline SPS-510 speakers fit perfectly in a small space, were easy to install and sounded better rounded that the Kicker's that they replaced. For a small speaker they put out a big sound that perfectly compliments my Alpine head unit, I was especially pleased with the full mids & crisp highs.
Summary: Had someone else do the install for me. But the install paired these SPS-510s up with SPS-610Cs and a new MRP-F300 Amp to replace factory Infinity system along with a previous installed Alpine CDE-124SXM radio and the sound is fantastic.
Summary: Purchased these with an Alpine deck and a Rockford Fosgate Punch PBR300x4. These speakers sound worse than the stock speakers in my 2001 4runner Limited. Also required mounting modification on all the doors. The range of these speakers is pretty limited - the sound is muddled.
Summary: Fine speakers. Easy installation (20mn) for someone handy who had never done this before.
Pros: Good sound, hefty feeling of a good build for the speaker itself. Intuitive installation.
Cons: Not completely easy to fit the speaker. Original thickness of mount is bit different. For some reason the two speakers didn't mount exactly the same way. In the end I guess it's inconsequential. On could nitpick about sound quality, a bit bright, with bass a bit undefined, but for the price, thes...