Subwoofer install without power cables..?

[Bazzheadnorway]

I have a VW Golf 7 GTE (which hasnt the dynaaudio option..)

So i want to upgrade the sound without open anything / upsetting my car dealer

I was thinking of making kindof a "boombox" in the trunk, were there is a subwoofer with an amp and battery. but the battery wouldnt be connected to any alt cuz there wouldnt be any power cables from the front, it would just be charged every night (like the car) with a battery charger. how i would get a signal to the subamp is still a debate. most likly it would be a dual jack (one to the OEM stereo, one to the subamp)

So my question(s) are:

car battery inside the cabin bad?

would the battery die after 5mins? (would be a DDM45 500rms amp with two 15s)

the battery would be aftermarket so guide me on how powerfull battery i need (5hours max play time deacently loud)

thoughts? haha

Hope to see some replys //content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif

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[crosjr 10+ year member]

This really isn't a good idea. You will need to tap into the factory head unit for the source anyway. The only part you would avoid by doing it that way is running a power cable from the battery in the engine bay to the amp. So for the hour or 2 to do that, you would rather charge a battery every night? Might as well just do it right.

 

[Bazzheadnorway]

Iknow it sounds ridiculous but it is a leased car so i cant do anything with the car (open up head unit etc and do it right)

batteries in the cabin arent toxic right..?

 

[EnvoyDenalii]

yes you can use batteries in the cabin, trunk etc. just make sure you

use AGM batteries. they dont leak acid because they are sealed

and the acid is absorbed into glass mats. as for getting a signal u will

need a LOC in which you will have to tap into one of the speakers.

so u will have to modify the car somewhat. As for how many batteries

you will need to get 5 hours of play time... well im not a battery amp

hour guy, im sure someone else here could get you a better answer, but

im sure it will be alot. Ar least 5 group 31's AGMs to start. how long it will

play wll depend on how many amps ur amp will pull from the batteries

and how hard you push the subs.

you do know you can put in a proper system and take it out when your

lease is done right? its not like your car has those seals on it that

let manufacturers know its been tampered with right? I would just do it

the right way and just remove it when the lease is done. hope this helps

good luck