Car subwoofer is very important thing, you invest so much money on it, so here are few things which you must consider;
First, required power of subwoofer — subwoofer with high power is replaceable. Thus, focus on RMS power ratings, instead of peak power ratings. The RMS ratings measure consistent power handling or output, and has much realistic measure as compared to the peak power.
Make sure the subwoofer can at least handle an output power of your amp
Sensitivity Level— The sensitivity of subwoofer goes hand in hand with power to gain high output. So, any audio product or device with higher sensitivity rating needs very less power to produce same amount of sound as model takes with less sensitivity rating.
Frequency range — Next comes the frequency range which actually determines how low a subwoofer can play. Remember that though actual performance of subwoofer depends on many variables, such as box type its mounted in.
Inclusion type — the inclusion or enclosure type subwoofer is something that is mounted in, and has big effect on sound type it generates. All in all, fixed boxes give you the most profound, most exact sound, while ported and bandpass walled in areas produce more volume.
Number of voice loops — Dual voice curl subwoofers are a mainstream decision among vehicle sound devotees who need greater adaptability in wiring their sound frameworks. While ordinary subwoofers have a solitary voice loop, double voice curl (DVC) subwoofers utilize two separate voice loops, each with its own associations, mounted on one chamber, associated with a typical cone.
Woofer size — It's a ceaseless inquiry — what size subwoofers play most intense and least? It is anything but a simple inquiry — you have to think about affectability, nook type, and accessible force. In the event that your definitive objective is to have a framework that plays uproarious and low, and space isn't an issue, go for the greatest subs.
The car subwoofer manufacturer today provide product with many features. So make sure to which car subwoofer supplier you visit who know what market and consumer demands