I did the dash upgrade a while ago with Infinity Reference, and the improvement was noticeable but not groundbreaking. I did the door speaker upgrade (RWD so no active tweeters in the doors yet) and the difference is much more pronounced. The old midbass was muddy and lacked refinement, but was quite loud and at certain frequencies, there was quite a bit of bass. I installed Hertz MPK165.3's in custom brackets and they are quite spectacular overall. The quality of bass has improved a lot, and while certain frequencies are not as loud as the factory woofers, there might be a bit less bass overall there is a broader range of much better bass, most noticeable with punchy "fast" bass and the quality of lower bass. It still needs a subwoofer so I feel once that's installed it will round out the low end nicely, and tweeters will complete the high end. The tone or characteristics of the Hertz woofers matches the infinity's better than the stock woofers did and the system doesn't sound as "disjointed" I'm not exactly sure how to accurately describe the overall sound with Infinity's on the dash and Tesla midbass but something just wasn't quite right.
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The color of the bracket is a bit odd in the installed picture.
I also bought Stinger Roadkill Fast rings, but didn't install them yet, does anyone have experience with these?