Summary: A little boomy but amazing depth in frequency response out of a tiny enclosure. I replaced an MM840DVC that I had blown with this. While I might say that the Polk was more accurate the JL achieves much better low end which is a fair trade for me.
Pros: Good power handling.
Incredible performance from tiny enclosures.
Astonishing bass response for an 8".
Could be more accurate with more acoustically oriented music.
Summary: I love the 8w3v3 I have it in a nissan d21 pickup, and it hits extremely well. I've had people ask if I have two 12s in my truck. It's really nice to suprise people when my old truck bumps. Definitely will stick to JL in the future
Summary: Incredible sound for an 8" sub. Also fits in a very small box. I replaced my 2002 factory sub in the back with this and it made all of the difference. I've also tried it in a 4 door truck, again great like a good 10" sub. Also in 2 Cameron's and it never disappointed me.
Pros: -Small air space
-Packs a punch
-Has great extended bass and lows (similar to a 12")
-Great classy look
Cons: Mounting depth (but not a big deal for the sound you get).
Summary: Awesome quality of sound. I have them in a sealed enclosure presently(.55 cu. each), powered by a 500w JL amp wired @ 2 ohm. I am planning to build an OEM spec. labyrinth vent box and expect to increase output. So far I like them and will update the outcome.
Summary: Awesome bass output so much it's astounding, very loud clean bass make your vehicle go pounding! Haha yeah.. Nice JL 8 inch woofer has superb sound quality and fits my needs perfectly! Also, remember that this is an 8.. an EIGHT not a 12 or 15 but will deliver sweet bass for such a small speaker.
Summary: Nice moderate power sub. Great choice for small spaces or simple installs. I've had this sub in a few cars in 6 years. I've had it powered by an MTX Thunder sub pushing 200W RMS x 1 @ 4ohms while running component speaker sets off Kenwood Excelon head units in all applications.
Pros: Great for tight spaces and/or vehicles where the sub is installed within the passenger compartment. You can totally embarrass factory "premium" systems using this sub as your centerpiece. 4-way power from a higher-end head unit and a couple hundred watts to this JL sub and it's not even a contest.
Cons: Probably not enough for bass heads in trunk installs. A 10" will probably be more to your liking.