Yes you can do it but you won't be happy. A stereo system is like a chain and since we all know that a chain is only as strong as it's weakest link, putting a better sub into a shitty enclosure will not net you the improvement you're looking for.
anyone know if you can just buy a better 8 inch sub thats direct plug n play with the sahara system?
I'm assuming that you believe that by installing a theoretically better sub woofer you are thinking you will improve your bass response and impact. If this is the case you are at the mercy of more variables then just the sub woofer itself. You have to deal with enclosure construction, enclosure volume, enclosure placement, cone displacement and amplifier power. All of these variables work together to create the most efficient sub woofer possible.
In the case of the JK's Infinity sub woofer there are several issues wrong with it.
- It's too small. An 8" sub just doesn't push enough air to get loud. It will perform adequately but if you're looking for a bigger punch then you really need to consider a bigger diameter sub or an additional 8" sub. I guess you could port the sub to take advantage of it's back wave for added efficiency but in the case of the JK we are dealing with a sealed enclosure.
- It doesn't have enough power. The Infinity amp is only sending the sub 46 watts x 2 for a total of 92 watts. This amount of power will not generate enough force to get the most out of the woofer's cone displacement. This means that the woofer will not be able to generate enough air movement to create the loudness and punch you want to achieve.
- The enclosure is made out of cheap, thin plastic. This inefficient material vibrates and resonates very easily. This resonance robs energy from the sub woofer that could make the sub work more efficiently. Essentially, poor construction material does not allow the speaker to work properly.
- The enclosure is too small. Generally speaking, for an 8" woofer to generate enough air movement to perform efficiently you're going to want to have at the minimum, .8 cubic feet of volume. The factory enclosure is probably only .3 cubic feet. This loss of critical volume restricts how loud a sub can play. Additionally, the loss of volume affects the back pressure of the woofer which in turn affects how fast and far the woofer moves in and out. This cone movement is what creates the sound waves and makes the woofer sound loud, deep and punchy. If the cone movement is restricted then the sound of the sub woofer is affected.
The above issues all have to be addressed in order to effectively upgrade the sound from a sub woofer. If any of the above issues are left as is then money spent on expensive after market speakers is wasted. By just replacing the sub woofer you are not dealing with the REAL reason why the bass is not adequate. Essentially, you're throwing money down the drain.
If you're serious about upgrading your bass output you not only need a new sub woofer but you need a new enclosure and a more powerful amplifier. There really is no other way to do it, unless, of course, you just want to throw money down the drain.
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