After I upgraded the front woofers, added dynamat, upgraded the tweeters, it was time to tackle the mid-woofers. I wanted something that would fit, match the sensitivity, and that was well controlled.
I choose the Memphis audio 2.75" mid-woofer which left a small gap (that should be remedied with some mounting options), but more importantly the depth fit. The original have a depth of just less than 2" so the upgraded option must also have a depth of no more than 2" because of how it mounts against the 6.5" inner door card.
To control the frequency I used a capacitor of 68 microfarad (mF) paired wit an inductor of .1 mH. The capacitor blocks bass frequencies that would overwhelm the small driver. The inductor blocks the hi-frequencies which are handled by the tweeter. The mid-woofer and tweeter share a common take off. Whereas in the rear it seems the audio is routed to the mid-woofer then then to the tweeter. I think that is for a different post though.
I bought more of the 68 mF capacitors to block bass or hi-pass frequencies the small factory center and rear surrounds cannot play. While I am not going to upgrade these speakers I am going to add capacitors to them.
Later I am going to add .85 mH inductors on the front and rear woofers which will block high-frequencies from being played by the woofers. This should help clean up the sound when the volume is turned up. After all this next are the subwoofers!