Answers: If the battery is '15volts' or more, than YES. The amp will put out more power due to more voltage.
You'll involve to make sure the amp can fiddle with the extra voltage, though.
replaing your car freestyle will not make your system louder. it will allow you to play the system longer while the vehicle is off since it dies. while your car if running the alternator is the most important source of power. if you want your subwoofers to be louder then you involve to upgrade to an amp that will deliver more watts to your subwoofer, and make sure you own subwoofers that can handle the increase within power. that will make the most significant difference contained by the loudness of your music.
other ways you can make your subwoofers somewhat louder :
1. use a custom box made to their specifications
2. get woofers beside a higher sensitivity rating ( the better the rating the louder the woofers get on indistinguishable amount of power
those are 2 ways to get somewhat bit louder, but your amp and subwoofer choices will determine the potential for how loud u can be.
RJ is spot on.. a Kinetik battery will not formulate a system louder, not even slightly... in reality even the claims of better sounding system i believe to be false. If you want to upgrade your electrical system i would start with the big three, it will trademark a more significant difference, if any is to be made.
If your looking for a louder system, then a custom box can do that hugely well... hold a audio shop make a clean box with SPL as a dream and likely you could gain at least possible 3-6db, and thats the equivalant to doubling your power... or even triplling your power. This method may result in the sub not sounding as accurate or "good" but it will variety more noise, and hold a larger impact.
UPDATE:
Ohm is right if the battery puts out a bit more voltage it will increase the wattage, however when you convert that to existing world DB's it is only a slight difference one that will possible not even be noticed... for example do you hear a big difference from the vehicle off to the saloon running? thats a even larger voltage increase, from 12 to around 14.
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