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Email Alpine and ask for a box build sheet.
They give you extact dimensions for the size of box, port size and length of port aswell.
Up or down is no different, internal car volume is to small for...

You are basically trying to choose between active and passive setup.
If you have money to spend and want the absolute best sound out of your speakers active is the way to go hands down.
It can get...

u definitely want to run a bigger gauge wire, either 18 or 16 gauge so be more than adequate.
the stock wiring is very small

500watts is not merly enough power for 2 woofers.
Your better off getting one woofer, my preference is always a 10" in a small car like a mazda.
1-10" woofer built in a ported box tuned properly...

paint spoiler and grill yellow to match and then yellow hatch door light overlays and dark tail tinting and you might have something.
Right now it does look unfinished

Road noise was a very minimal change, but for bass it helped fix all the rattles.
I did the entire car from floor up and also added foam inbetween the door frame and the trim panel

no daytime shots and the projector fogs are coming off going back to OEM.
They looked nice but its alot of work to install aswell as you have to do it right so i never had time to properly fix them

I wouldnt downshift very often unless your passing or turning a corner.
I wouldnt downshift into 1st anways your just asking for trouble.
Use common sense, dont downshift when your at 4000RPM

an 8" will give you good kicks but not good low frequencies at least not as good as a 10 or 12

Spending $800 on a sub IS ridiculous especially if its a 12 or a 10.
The only way you would pay $800 for a sub is because its a 15 or bigger and your seriously going to put a heck of power into it....

im on my 2nd year without a problem. before winter i just spray them with a silicone lubricant to protect the threads and clean them after every winter.
No major rust yet and the only problem i have...

Ive done it, took about 150sqft and about $300 dollars.
If your confident and good at taking things apart 2 days is all you need. 8am to 8pm or later each day.
You will not see a significant...

http://m.seimg.net/product/img/subwoofer_wiring/2_subs_DVC_2_ohm_mono.jpg
http://knowledge.sonicelectronix.com/tools/subwoofer-wiring/

Dual voice coils at 2 ohms would take a 2 ohm load from the...

Funny how you use JL as a example. One of the most over rated audio companies in the world. Just that is enough said.
Simply put like i said before if you are a professional in the car audio...

I know guys in the states with no credentials that would amaze you into how much they know about car audio.
You think soundman and stevemead have credentials, yet they are some of the top audio...

Cheap pricing and convenience is not always worth it.
In car audio getting a cheap quote does not mean quality.
I know a lot of installers that are cheaper than others and some installers that are...

This is true when there is an un-obstructed line towards your head. Your door speakers are blocked by your legs when driving and there is too much deflection down there anyways.
In Car audio optimal...

GTshenal, word off advice.
Come up with a budget, this is extremely key.
Then work out your wants, first start off with your deck.
Do you want double din? Nav, Bluetooth, Ipod, Sirius?
Once you...

I would get thicker mounting adapter like a MDF one thats about 1/2" and you should be fine

Cap on amps are useless, period. There is too much voltage and amperage draw at each bass note to help, just like said it would drain before the 2nd beat hits and then its a cripple.
This might not...

Alternator would technically be the only thing to check.
You battery doesnt work when you car is on unless the voltage drops below 12.4, that is when your electrical system uses the battery....

You cant have everything you want, you have to be able to give a little to get a little.
You want better audio than you have now but you want to keep stock look, this doesnt work, you cant get...

+1 multimeter. check online for this method its very common method

http://www.knukonceptz.com/

by far the superior car audio wiring

i would consider saving up some money for a decent 2 channel amp and a component set of speakers.
The subwoofer has the potential to drown out 3 way speakers...