Vehicle:
2010 Hyundai Santa Fe Limited 3.5L (currently with the stock, base model door speakers + tweeters still installed)
Gear that I already have I'm going to be using for sure:
Joying 7" Android 12 Head Unit with optical output (installed two years ago and I love it!)
Helix DSP.2 (connected via optical; plus a custom control panel I built for my dash... just bought this DSP 2 years ago for this build)
Kicker ZX750.1 (~900W RMS at 1 ohm... I've had this for ~15 years, still "kicking"...)
Fi Q 12" Dual 2ohm (also had this for ~15 years, also no sign of needing replaced)
Custom down firing sealed box I built for this car; will be a stealth install when I'm done so I can still use the storage area.
Will be doing basic some sound deadening on the doors and other accessible areas, but I'm not gutting the whole car to do it.
All wiring already installed (0/1 Knu Kolossus for power; two runs of Knu Karma SS to each front door= ready to run active tweeter+woofer "some day")
Plus I have these parts left over from previous systems:
JBL P660C Components (bought and installed in 2006 Hyundai Sonata in 2017... used until I sold that car about two years ago, so ~4 years of use)
Kicker ZX200.2 (2x76W RMS at 4ohms... was running the JBL set. I've had this for 15 years)
As you can tell by the fact that I'm using lots of old stuff in a 13 year old vehicle (low miles, no rust, it's a good car! heh), I am on a budget and I only like to spend money where it will actually make a noticeable difference. The DSP was the big spend on this one, and I got that second hand (in box, great condition) two years ago for around $300, which was a smoking deal. I do own a measurement mic (calibrated MiniDSP UMIK-1) so I can get the DSP set up properly.
Should I go active with a four channel amp to make full use of the DSP? Should I replace the speakers? Or, will I be hard pressed to notice any difference versus my old stuff once the DSP is set up? I read lots of praise for the P660C when I bought them... are they likely to handle going active alright, or should I just sell the set and buy something else?
If you think it's worth it, I would appreciate some recommendations for some budget tweeters and 6.5" woofers and a 4 channel amp. I don't mind buying individual woofers and tweeters if I can save some money and end up with something better. I don't really care about getting "car audio" brand name stuff. Quality + value is the most important thing. I will do my best to treat the door panels to improve midbass, deaden vibrations, etc. but they definitely aren't going to be 100% sealed. It's a car, nothing is going to make it an ideal listening environment, but I'm hoping for good all around response, noticeable midbass and highs that aren't harsh.
As for a dollar amount budget, I don't have a specific number in mind... I'd rather just see the best bang for the buck options you guys recommend. But to give some rough guideline, we're definitely not talking about components that cost $100 each here, combined with a $400 amp. That's just way too high for me right now. Remember... 15 year old sub, amp etc. By comparison, the entire P660C set was under $135 when I bought it in 2017 and it's been running off the amp I bought for less than $150 in 2008...
Thanks everyone!
EDIT: Forgot to mention, the JBL component set is advertised as 2ohm. I know things are always more complicated than that, but I figured it'd be worth mentioning since most sets like these are advertised as 4 ohms. I'll be honest, I haven't measured them individually to see what they are without the crossover network.