*don't forget the batteries...this could account for 1-3 dB
*use an aftermarket high output alternator...try to get an adjustable regulator...this can often gain .1-1dB
*make sure you match the impedance of your amps to the impedance of your sub...it is safe to say that if you amp maxes at 1 ohm, you need a .5ohm DCR to get full power after considering for A/C inductance and impedance rise of the enclosure!
*Use a ported box...yes you can get loud with sealed, but ported gives you more bang for the buck
*don't bother with things such as 1/4 waves or 1/2 waves...they are just a waste of time...also, don't let computer programs dupe you into building the wrong box!
A couple of safe boxes...
for a 15...try 5.0 cu ft total with 65 square inches surface area port that is 16" long
for a 12...try 3.3 cu ft total with 50 square inches surface area port that is 15" long
*remember...it is power per driver, not the total number of drivers that will make you loud!
put your woofers towards the passenger side and your ports towards the driver side...
don't use caps...they will hurt you in SPL!
go for amps with unregulated power supplies...they are often better for spl purposes...(they tend to offer more power when given higher voltage input)
use a preamp whenever possible
do NOT match the gains on your amplifiers...this is bad...your best bet is to unhook your subs, play your peak frequency, crank volume to full comp setting...then test voltage on each amp...do not match them, but rather turn the gains till each amp PEAKS out...who cares if one does 65 volts and the next does 91 volts...power is power...the meter doesn't know which amp is putting out more power...
the list goes on and on, but that should be a good start
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When in doubt, go with the woofer that sets the records!
), work on getting the little things right first. Like voltage, sound deadning, wiring, just the little things. If everything like that is right, your system will work out better in the long run. Start out with a good foundation. Then add to it!! Don't go buy 2 US Amps 2000x and expect to run it off your stock electrical system!! Make sure everything is balanced. Like your speakers and amps are of the same quality. Don't buy a RF Power HX2 15 and try to push it with pyle 100x2. It's okay to mix and match, but try to make sure they mesh good!! 
) is the proper box design for your subs, and applying it the best in your vehicle. If you buy a pair of subs, just don't run out to Best Buy and buy a box to throw them in. Take into consideration the proper airspace for the subs, what kind of specific box design your subs and listening habits will tend to (sealed, ported, etc). Make sure that the box is constructed out of a solid/ridged material, and make sure that the sub placement in your vehicle is correct. Placing them in different spots may have very different audible effects. Remember, good equiptment will only get you halfway there... it also takes a good install to make it great.
Linear Mode
