Subwoofer and amp installation in truck?

Any bigger than this then youre an ahole (MAYBE a10")
Wires up easy, fills out the sound, wont give you subsonic range or rattle the next truck over's mirrors, but see my first comment....

m dubious that your entire truck is 24 v, thats probably starter only

 

I think his comment has to do with how annoying loud audio systems can be to folks around them. If you're considerate of others, this won't pertain to you. I have had to knock on the door of another truck while trying to sleep and ask them to turn their volume down (it was at one of my company's terminals, so the risk to do it wasn't as much). And, considering I'm a reefer jockey and used to various noises around me, his volume level was excessive. He was also parked about 3 trucks down from me too.
Anyway, some folks get annoyed when others blast their audio systems and it's especially noticeable in the bass range where that thump thump thump permeates much more than the rest of the sound.
As to where to tap in for power, if you have access to your inverter, that could be a good candidate on where to tap into some decent 12 volt power. It'll depend on how heavy duty the wires going to your inverter are, how much power (amperage) you're going to need and how the location of it all works. But, that would probably be the first place I'd look to consider.

 

Power wire will hook to the battery just fine. The batteries are wired in parallel where amps increase but voltage does not so it is a 12v system.

 

1st and foremost your truck... the hole truck is 12v...

Your batteries are wired parallel..
Pos to pos to pos to pos
Neg to neg to neg to neg
Look and see
This increasing AMPERAGE not voltage.. I E 12V but amperage from 2,400 to 4,500 depending on batteries

Series would be batteries wired pos to neg and neg to pos increasing VOLTAGE but not amperage... 2 Batts = 24v... 3 Batts = 36v.... 4 Batts = 48v

So yes you can just hook to any battery...

 

I had I believe 2 12”s and amp in my sleeper and it would rumble and bumble. I used it for OTR so I took it all out for the extra room. It was wired from front to back under the drivers side carpet and on under the sleeper carpet.

@Diesel Dave could probably answer more about it. I only jammed a couple times lol.