Chan546, I am in Rocklin so if you are ever in Sacramento or are on the way to Tahoe, let me know. I don’t get down to your area very often.
Here is what I would recommend in priority order for best bang for the buck:
1. Soundqubed subwoofer retrofitted into stock enclosure - under $100, not louder bass with stock Tesla Premium amp, but less muddy and more defined. First driving it through the stock Tesla Premium amp will also allow you to break-in the sub in 48 hours of listening without having to limit to 50% power. It’s a nice way to prepare for the LH amp which sends a lot more power than stock.
2. Light Harmonic Amp - LH has options for just the amp or bundling with speakers. The amp alone is $1,200. This amp is a direct replacement of the stock Tesla premium amp and drives the front door woofers, rear lift gate midranges, and the sub. It bolts into the exact location of the stock Tesla Premuim amp and uses the same bundled wire connector as stock. The stock Tesla base amp daughterboard drives the tweeters, 3 front dash midranges, and rear doors. The LH premium amp is not cheap, but the improvement is so excellent it is worth it in my opinion. Make sure to let Light Harmonic know if you have MCU1 or MCU2 (there is now a difference between them in the LH amp).
3. Light Harmonic door speakers - excellent stats and nice sound complemented by the LH amp. 1.2 ohms - this makes a difference. Front and rear door LH speakers can be purchased on Amazon at this time for $865.93 ($999 on the LH website). I recommend the Gen 2 version. Complete plug and play, excellent fitment. I suggested to LH owner Larry Ho that they make a 200mm version of this speaker for the front doors. Tesla stock front door speakers are 200mm and the back door speakers are 160mm. The current LH front and back door speakers are 160mm, but the smaller fronts still sound much better than the stock larger fronts, in my opinion. I can only imagine what the LH fronts would be like in 200mm.
4. All other drivers - the two midrange speakers in the rear lift gate are the only other speakers driven by the LH amp. All remaining speakers are powered by the stock daughterboard amp so we don’t get any more power for these, but upgrading to the best spec speakers available in sizes that fit in stock locations and with matching or close to stock impedance makes a big difference in sound quality. I used Hertz and Morel for the remaining speakers - excellent specs and close on size. I attached the Hertz midranges to the lift gate in the stock openings using supplied u-nuts and screws. The dashboard speakers were much more difficult and required fabricating mounting adapters. Moving the top dash out of the way to remove the mesh was a pain because the airbag is attached to it and unplugging the two electrical connectors to the airbag can be challenging. The Morel tweeters fit in the stock mounts in the a-pillar trim. Lots of effort overall, but the front stage lit up on the high end and I had to significantly back-off the EQ in the higher frequencies to find a nice balance across the sound spectrum.