I've decided to either go with 1 10" or 1 12" sub..Looking for a sub I can run down to 2 ohms, so my powerbass amp can run it @ 700 watts...Which sub and box should I invest in..I'm not good at building..Looking for that boom
optimus, in effort to keep from getting overly technical, a couple of basic thoughts here.
Most importantly, any amp must be terminated into a load (Ohms) above its minimum rating. As an example, you *could* connect the worlds best 1,500 watt amp to the worlds best 2 ohm speaker system and fry that amp in a hurry if the amp can't handle a 2 ohm load. You MUST make sure an amp is connected to a load that falls within its design parameters or you'll cause it to implode. No matter what power rating you go for, make sure the amp can safely deliver its rated output into the load you connect it to.
As Ian pointed out, speakers can be wired in several ways. Depending on how many speakers are in a circuit and the connection sequence used, you can determine the final "ohms" the amp will see. Let's say you started with 2 4 ohm subs in a box and a mono amp. At your option, those subs could be wired to present 2 ohms or 8 ohms to the amp.
Interestingly, if you were to add 2 more 4 ohm subs, you could wire the 4 subs in a way to present 4 ohms to the amp. This topic could get wordy so if you want to know more, take a look
here, you'll definitely learn something.
If I recall, you have a factory head, a "LOC" a good sized amp and 2 10's right now, but you aren't happy with the amount of BOOM you are getting? If that's true, I would suggest you have a wiring issue. Again, we could get technical but I don't think that will help you. I STRONGLY recommend double/triple/quad checking the wiring through out your system. If the set up you have described is not booming your ass right out of the truck, I think there is a speaker wire crossed somewhere in the signal between the head unit, the LOC, the amp outputs or the subs. No matter how big the subs, ANY system can be made to sound "thin" in the low bass range if (for example) the right side speaker wires are connected backwards in relation to the left side.
Here's a 5 minute short cut to try right now: take one sub out, switch the wires. Put it back in. Check that boom. Is it back? You are done. If it still sounds thin or thinner, I'd venture a guess the problem is between the head and the LOC. MAKE SURE R + & - from the head is
correctly connected to R + & - to the LOC, and do the same for the L side.
Want an even quicker check? Don't take anything apart, just use the head units balance control to adjust full R then full L. Does the bass sound "better" in either position than it does in the center? If so, you've got a wire crossed somewhere.
EDIT: It is especially important to ensure output the L/R +/- wires between the head and LOC are correct. If these get crossed, big trouble can follow.
Edit 2: These comments assume a sub enclosure suitable for the 2 10" subs in your system.
That system should be bumping your cranial cavity so hard right now that your poor neighbors should be calling the police. I ain't trying to be funny either. Check it man!
BTW and once more: it isn't a matter of opinion, its mathematic fact, in most systems you will NOT hear the difference between an amp rated for 500W vs an amp rated for 1KW. If you are seriously considering replacing the amp you have just to get a few extra watts, I would suggest your money would be MUCH better spent on replacing the factory head.
Carry on...