You'd need at least $300 in sound deadening alone for a 09. The doors on these are awful for sound, worse than most. Not much wiring to tape up quiet but one giant hole and super thin metal to deal with. The floors almost as bad until later models, after 2011, with better factory soundproofing. Rear hatch and cargo area very easy to quiet.
I've heard nothing about the head unit, amp integration or a subbox. Those can get spendy. Does your crv have a factory navigation screen?
Is there a subwoofer under your passenger seat?
Do you have speaker grills or cover for factory dash locations?
Are you using a PAC/Stinger wire harness, or a iDatalink adapter?
Mainly what's the source? I'm guessing not a bose factory system. And how will you be integrating the amps in? Aftermarket HU already installed?
If you plan on keeping that 09 for some time, hold off on equipment and sound deaden the entire thing first.
For subs and sub amps go Skar. Whether a basshead or not, it's the best option to save money for more the important components. I've had JLs best subs and I've had skar subs. I could only tell the difference, or hear any major differences, when subs were used in a pass through system where the subs are actually in the cabin and facing forward. For trunk or hatchback subs more properly placed and tuned, I could tell zero difference. What I'm saying is you don't need big bucks to get loud quality bass, if there is such thing.
The majority of build budget, unless you're a total basshead and only care about SPL, should be going into the front theater.
You had a lot to add, and I appreciate it. (In retrospect, before I post this, I'm realizing I've a lot to say, sorry)
Edit: It seems like sound deadening is
super important, so would you think that installing my HU and buying only the speakers and sound deadening would work out? The radio only puts out something like 22rms, but those are 100w speakers. Add the amp in later, and the sub after that? Do you have a particular type, brand, or material to recommend? How would you spread that ~$300 over the car?
I've got an (quite) old Kenwood HU, it's a HD545u, but it's served me well in a couple of my previous cars, as well as my older brother's (I got his HU and Polk 6x9s and 5" speakers from him when he left for the Marine Corps, but I wanna say he bought those 2008-2010). I just plan on using that to start with. It's got 6 channel outputs, front, rear, and sub, so my plan was to just go from it to an amp.
I'm going from my 2010 Fusion that I upgraded with Alpine 6x8s in the doors, I added my Polk 6x9s in the rear deck (just wired them into the wiring for the rear speakers), and kept the factory tweeters. I really enjoyed this system, even though I'm certain the factory radio didn't actually push any of those speakers properly. It also had like little built in speaker housings in the door from the factory. It really did sound full, had some real depth, and I could actually feel the bass from those 6x9s in my chest.
The CR-V is just awful in comparison. It's only got the basic sound package, and the basic AM/FM single disk radio, so no tweeters, and no sub. The system is quiet, the bass roll off and EQ is just bad no matter how much I try to tinker with the radio's EQ or balance my EQ out from spotify (I primarily use Spotify through my phone, though I have a select few CDs I like).
I know sound deadening is so important, but I'm selling my Fusion, and I think I'll be lucky to make $1k profit, and whatever I make out of it is my budget for my new audio. I'm thinking about skipping out on the sub for now too, and just getting an amp to go with the composite and coaxial speakers.
As for sub enclosure, whether I do the sub sooner or later, my step-dad has a mostly full work space in his garage that I could very easily just get some wood and carpet to make a basic sealed box (though I've seen about adding things inside the enclosure, I'm not sure how popular that is). I've been planning on trying to put an amp under one of the rear seats, and a vertical sub box across the trunk, behind the seats.
Edit: I'm thinking about going for an open air subwoofer, so I can install it in one of the side panels of the trunk, for a little bit more low-key of a look.
I just got the CR-V from an elderly family member, so it's in good shape, and I plan to drive it until there's some sort of catastrophic damage. I think I can deal with having imperfect, but better sound than what I've got now.
Edit 2: I'm seeing things like 1mm-2mm thick, and around 25% coverage at the bare minimum (I'm really fine with the bare minimum), but not sure how accurate that is really kinda looking at just doing the doors and hatch at the moment. But I'm also seeing people (seemingly super comprehensive builds) that are deadening pretty much as much of the doors and other areas as they physically can. Though, it seems like
Amazon Basics is solid, for a pretty darn good price.
Are there any liners that you'd recommend more while I'm still kinda shopping?