Just wanted to share my experience with these dash speakers. Some are happy with the stock sound, I was most definitely not. There is a harshness to certain tones, mostly vocals, that make me turn the volume down. I also felt there were some frequencies underrepresented, not just due to the lack of tweeters, but mids too. The soundstage also stinks. Some people hear the decent bass those door woofers put out and think its a great sounding system. I'm sorry, but in this case it's not all about dat bass. I've had great experiences with Infinity Reference in 2 cars, so I started with just the two 4032s in the L/R dash.
I installed without any brackets or adaptors. I tried to harvest the male bracket from the stock speaker, but destroyed it. I'm sure its doable with a small cutoff wheel. I ended up just using bare, solid core speaker wire stuck directly into the female harness. I thickened it with a bit of solder, it fit snug, and I taped it well, it ain't going nowhere. The other end of the wire is soldered to the Infinitys. I used 2 layers of speaker foam tape because without an adaptor the magnet bottoms out inside the dash. You need to remove or bend one of the mounting tabs, the one that will be closest to the window. Then I screwed down the 2 tabs that line up with the stock screw holes. For the 3rd, I used an angle drill attachment to drill a small hole through the dash and used the stock screw. The speaker seals well and feels solid. There is the possibility that without backing behind the tabs they may bend over time, but if that happens its an easy fix.
After installing the first speaker I tested stock vs Infinity by fading back and forth. I could definitely tell I was going to be happy with the change, but the stock center speaker worried me a bit. I was concerned it was going to be too loud. I installed the 2nd speaker and confirmed that the middle speaker still had some harshness. I suspect the stock speakers are more sensitive than the Infinitys, which would make them louder with the same power. To combat this, before I reinstalled the dash I taped over the underside of the center grill with two layers of fabric wire harness wrap. It stuck nicely, and muffles sound slightly. Reinstalling the dash was a PITA, but once it was on I was very happy with the change. So far I haven't noticed any vocal harshness, the center speaker is noticeable but not overpowering, the tweeters add some much needed highs and staging, and the sweep handoff from the door woofers to the dash is seamless.
For those wondering, the center speaker most likely us used for mono sound. I assume when the amp detects the same signal from the L/R channels it sends that to the center speaker. I think the idea is it helps with imaging when you have multiple different listening positions. I've never had a center speaker before, and I never have anyone else in the car that cares about imaging, so I considered disconnecting it. I have heard, though, that the navigation only comes through the center, and I don't think I want to lose that completely. Its probably best to replace the center speaker as well. but they only come in pairs. If anybody wants to go in on a pair let me know, I'll split the cost and shipping with you.
I have the Hansshow activation harness coming, the one the rep told me won't work for a 2023. We'll see. But now that I have actual tweeters in the dash from the coaxial Infinititys I'm not so sure the harness is going to add much. Am I going to have TOO MANY tweeters now? Worst case, I use the harness to interface with a DSP and tune it all to my liking. Until recently I didn't know that was a thing, but now that I've read about it, sounds fun!