ok I need everyones opinion on something... I am in the process of saving up to get a complete aftermarket system in my 94 ssei. I already have infinity 6 1/2'* for the front doors, but i need a head unit and 6/9'* for the back, but thats not the problem. the problem i have is that i dont know wether to go with 2 12'* or 2 15'*. my girlfriends brother had a tricked out mazda protege with 2 15'* that hit VERY low and hard, yet his girlfriend had 2 12'* that hit equally hard, this is why im stuck on my decision... Please gimme your input on wether you think i should get 12'* or 15'*.

You might want to go with the smaller ones. The reason I say this is because your compass module is between the back speakers. If you go too big, you'll throw off the compass that much more. I haven't installed any yet, and am not too sure if you pretty much give up on the compass when you do an install, or if there is a fix. I'll let someone more knowledgeable chime in here...

i had no idea the compass was back there... oh well, its not that big of a deal. dont get me wrong, I love the compass feature, but i would rather have bass so loud you can hear me a mile away....

I'm not completely sure it'* going to be an issue. Wait till the others chime in...

the compass can be relocated. if u want to just browse around and see whats out there check out nexxon.com thezeb.com or ikesound.com soundomain might have some good deals too, or if u want im trying to get rid of my orions

the compass is that little grey box that is in the middle of the 6x9'* when i installed my infinity perfects it threw it off and always said calibrate and did not show the right directions and if it did it showed the wrong ones since the subs that i installed had huge magnets the compass never worked untill i took the fasteners out with needle nose pliars and i just velcroed (industrial strength) or you can use duct tape and moved the compass farther back twards the trunk lid this fixed the problem my compass reads correctly now the only thing is that if your subs slide out of position and move further due to extreme driving the subs will throw off the compass and you will have to move the subs back and recalibrate the compass cuz the compass goes crazy and also if you take the subs out you will want to recalibrate the compass

You may be able to put the subs far enough apart to be fine. If your goal is pure volume and bass then 15'* will make you heard the most. the 12'* should sound better. What subwoofers are you looking at? I've said it many times, size does not matter... Take a 10w7 for example...

15s can sound just as good as 12s, only difference is the frequency bands, size isnt the only thing that matters when it comes to getting loud, voice coil diamater and linear xmax also have a lot to do with it

well of course i am looking into the best subs of all, kickers. I would love to be able to get the l5 or l7'* but they are way too expensive, so I was looking into comp vr'*, which hit EXTREMElY hard. I also tested some rf subs that hit hard and some polk momo'* that hit hard... how much are you selling your 15'* for jachin?? do they hit hard??

the only thing a larger subwoofer CAN get you is lower notes, and some more volume. 15"* are very big and heavy, and need HUGE boxes. I'd compare 1 15 to 2 12'* for SPL of the same brand. Kickers don't really impress me much. I think the square ones are just kinda silly. They don't produce even sound waves with the corners, and a cylinder or cone is the storngest, most uniform shape to use in a speaker.