I HAVE A NEW AMP AND SPEAKERS, AND THEY DONT SOUND ANY DIFFERENT.

get seperate amps the wattage needs for your subwoofer would be much higher than what would be adequate for your highs

Ok, so I am assuming that the other speakers are working, and it's just the subs that are not, right? If this is the case, start from the source. Make sure the RCA cables are plugged in and not crimped anywhere. Then to the amp, Did you check the gain levels on your amp. That is the knob next to the RCA input on the amp. Also, check the wiring to the subs. Make sure all your + are goinig to +. Sometimes in the "heat" of a good install, you just lose track of those things. When in doubt. Undo all your wiring and start from scratch. Good luck.

The amp may no thav eenough to push these subs, these are top of the line subs, they probably require a bigger amp, if you are running other speakers through this also, you certainly need another amp, or a bigger one with more channels. also double check all your wiring.

make sure if the amp work at 1 or 2 ohms you need to setup the same in the woofer.chek if the woofer is 2 or 4 ohms dual voice coil and how the amp work better

Well, 1.6 cubic foot for a 15 is not nearly enough. A ported box for 1 15 should be in atleast 3 cubes by itself. I suggest building a new box yourself or getting someone else to do it for you. If factory specs on those subs is no larger than 3 cubes per sub then I'd get the box built to 3 cubes per sub after all displacement and tune it in the upper 30's range. Putting big subs like that in a small sealed enclosure can and will damage a sub. and if you try to port an enclosure that is too small to begin with that will also hurt the woofer. Do it right or learn the hard way.

Hello meow_mix_666,

If you have tried different amps and different subs with the same result, I'd definitely suspect that you are not getting enough of an output signal from the head unit. Checking the RCA's and perhaps using a different set of preamp outs would be a good idea.

One other possibility that you may not have considered is to check the phasing. I've run into speakers that had the markings reversed and running the subs out-of-phase on a 4-channel bridged would make a huge difference in the bass.

Hope this helps.

Check the ohm measurement of the speakers make sure they are about the rated ohms.Check them UNHOOKED from the amp. (Useually 4 ohms.)

Try different subs.

This sounds odd, but try putting your subs out of phase from the mains. Just see if it changes anything.

rewire the whole system with new wires,you could have a bad ground or wire try it first if that dont work rewire

Yes it is probably too powerful for those speakers. Or the speakers could be defective.