Edit 1/6 - after I posted the diagrams below and read more // If you're just tuning in, I believe I did wire these correctly. I may have even been able to not cap off the factory tweeter harness since my new tweeters have internal crossovers. Ignore everything below saying the woofers had the internal crossover, they just have 4 terminals so you can send signal up to to the tweeters - again, I could have reused factory tweeter harness if I cut it where it becomes two wires and soldered to tweeter. I believe my error was reading all of the positive reviews for these speakers about bass, and expecting the setup to outperform stock in all ways. Since it's a mid range woofer (no clue what the factory one is but I assume full), I need to get a sub woofer and set my high pass filter up on my head unit. Then the mid range woofers and tweeters will be doing their thing crisp and clear, and sub (already ordered) will take care of the lows. I guess some people can get away with this setup if they have full range rear speakers handling the bass or something, but to just use this setup and nothing else will not sound as good as stock with any genre that has some deeper hits, even funk music. My bad, I'm an audio noob and didn't take 'mid-range' literally.
Was warm enough today to install speakers, so got to it (already have a Pioneer dvd headunit installed which helped stock speakers immensely). Did the drivers side door first using Rockford Fosgate 6.5" components.
I used a speaker baffle to get the woofer to fit and quickly DIY'd a mount for the tweeters reusing old bracket. The woofers have built in crossovers and Crutchfield only sent me a speaker adapter harness, so I connected the two wire speaker harness to a + and - on the woofer, and then connected the pre-wired tweeters to the other + and - on woofer. Again, tweeter was pre-wired by Rockford Fosgate, I just snaked wire down through the door and that was that.
Remembering about that 4 wire factory tweeter issue, and someone's fix, I snipped the factory tweeter plug off and wired red to red, black to black, wire capped, done. Everything works, so I assume that's good. However, the lows sound like absolute diarrhea.
Since I did just the drivers door before testing, I simply turned the key and music resumed playing. The factory setup on passenger side was 100% better in bass clarity. Anyway, I called Crutchfield and they said that it was impossible to have wired that up wrong (since there were two sets of positives, two sets of negatives, but they're all wired to the same single wire in woofer). I completed the install in the other door, and while the tweeters are absolutely awesome for highs, if I have any serious bass at even medium levels, it sounds very muddy. Even just listening to the woofers (ear down near them) sounds crapola.
Idunno how to tune these things but I did set the high pass cutoff to 'OFF' on my headunit and achieved much more bass in general, but yea, muddy. If I turn it to even 50hz I have almost no boom. I don't think I'm under powering these by any means, and have no intention of getting an amplifier for them.
Should I not have twisted those two reds and two blacks together from the factory speaker harness to close the loop? Am I tuning the head unit wrong? Am I retarded? The magnet and construction of these woofers takes endless dumps on the stock, yet doesn't sound good