Want some Subs.
 

But i dont know anything about them and amps and watts. can somone school me? And would i have to change out my nav screen stereo unit for something else or what? And i dont think i want the BSW sub because it just doesnt seem to be really powerfull, i want maybe a dual 12" setup or something like that.

Thanks!

Want to enjoy it while im still young.

had dual 12" Rockfords when I was in high school - think I ran them in parallel off a 500 watt mono amp. they definitely hit if it's heavy bass you're after!

no subs in the X - the trunk rattles enough as it is...

Buy a JL stealth box and put a grill on that factory cover panel. Trust me, it'll be plenty of bass.

JL Audio Mobile - SB-B-X5/10W1v2

BMW X5 Stealthbox by JL Audio

Seems a little weak though :( i think 2 12" would be slightly cheaper

Let's be honest - do you want this bass to show off or to enjoy it youself? I'm ok with either answer as I used to push 1000 watts RMS through 2 12"s not too long ago. I could show off like a champ but most of the time the bass was ridiculous/gave me headaches and I had to turn it down. Now I have an 02 X5 with DSP and I find the factory subs are fine (I'm only 26 btw)... I could appreciate a little more bass via a JL stealthbox, but it's just not worth the money to me at this time. My advice though, if you really want to THUMP... get some Kicker L7s.

-Cyrus

Mostly for myself, a little for show like, say at my practice or something like that. and my 04 doesnt have stock subs with it :(

Budget is going to be the biggest factor determining what you should get.

First thing I can say is stick to a single sub setup with more power rather than splitting the same amount across two subs. You will save a ton of space and likely save money. I promise you can get the output you are looking for out of one woofer.

Next, decide what your goal is, loud or sound quality or a combo of both (still, weight the importance) this will help determine which setup you should focus on. If you care mostly about output level or spl, I would recommend a large ported box with a sub similar to a kicker l7 that was mentioned previously.
The enclosure you use HUGELY effects the sound, probably even more than the sub itself. For more sq, go either sealed or a lower tuned ported setup and use a subwoofer target sq more...example would be Image dynamics IDMAX 12" jlW6 or similar.

A good combo of both sq and spl would be a jl w7 or re xxx. Both sound amazing in about 3 cubic feet ported at 32hz and 1000-2000 watts. Spendy however!

You can use the stock head unit, btw, and get really god precut voltage for both a sub amp and aftermarket speaker amp using a unit by audio control that converts and amplifies the signal from your stock head unit.

I'm running a 12" xxx with 2100 watts and focal 165v2s all around with a jl 6 channel amp...the front has 4 channels bridged to it. Sounds pretty amazing.

Thanks Rocky, that was quite helpfull!

Ill look into it a little more, that does seem quite pricey, i want more on the cheap side i guess.

Would this be alright guys? or is this a crappy setup?
Amazon.com: MTX TNP212D2 Dual 12" Subwoofer And Amplifier: Electronics