The heavier the woofer the louder it will play.The heavier the amp the more power it can produce.
You can make a "quality" product with crap parts and sell it on here for a great price.
Thiele-Small specs are worthless (but all manu's put them in the box and use them as ref)
You can use a battery to "make power"
You can get more power out of a amp than you put into it.
If you upgrade the fuse in your amp you get more power(PDX1000.1 excluded)
A cap will help your electrical system
You can blow a speaker from too little power.
You can damage a speaker from to much distortion.
The gain knob=Volume
DVC subs are louder.
If you load you doors with P.A. speakers you are cool
Quality install for a good price is overated.
The guy down the street will do it the same way for half the price and he says it will sound better.
Thats it for now.