Trying to install subs

Check crutch fields website for sub box construction you may need your sub manufacturers specs for the correct build sizes.

Bad ground, possibility of some wires touching

First disconnect the CD head unit from the sub amp and see if the other amp works. If yes, the problem is the wires to the amp, the amp itself, or the subs/sub wiring. If no, the problem is the head unit--probably an internal short.
If the other amp works with the sub amp disconnected, reconnect the sub amp to the head unit, but disconnect the sub wires from the amp. Try the CD player. If the amp goes to protect with no speaker wires attached, the amp is bad. If the amp is OK, the problem is the subs or sub wires. Hook the wires up to the amp again, but disconnect them from the speakers. Try the player again. If the amp goes to protect, the problem is the amp wiring. If not, the problem is the subs. Check the impedance of each sub using an ohmmeter to determine which amp is out of spec.
Please let me know if you have questions, and thanks for using Fixya.

THE AMP OR RECEIVER HAS A SPECIAL SUB JACK ON THE BACK OF THE AMP OR RECEIVER THAT THE SUB HOOKS UP TO. IT TAKES A SEPERATE CABLE.

Usually dont use 2 amps for 2 subs you can run 1 amp and two subs which is more common. But what i need to know is which cables if you are talking power cables or rca cables. If Rca then then go ahead wire together. Power is a different story and I need to know what you are pushing

make sure you have seperate power and gound seperate remote wires and if it does have a pass through then use it but i would hook up one at a time make sure they both work if after all this and it dont then your deck may not have enough power coming out of it to power the rca's or use y adapters from the cd player and run 2 sets of rca's.

if the amp is a 2 channel, u could either bridge them all, or if you wanted to, you could hook 2 speakers to the two seperate channels, and then hook the other one to the negative on one channel and the possitive on the other. if this wasnt what you meant, just, try to tell me more about the amp... thanks

Run the subs in series then bridge the amp. So run the normal + to - to the one sub then hook up a spare wire (not connected to the amp) to the same + and - connections. Then run the spare wire to the + and - of the other sub. This will tie the 2 together so you can bridge the ampfor more power instead of using 2 seperate channels.

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

The two seperate wire terminals on the sub are for dual voice coils which means. If You hook up the first terminal to the second terminal then run speaker wire from the second terminal to the amp.It should then increase the subs frequency response and sound better which also means it will be able to handle more bass. As to just having one voice coil hooked up. The two terminals is pretty much the bridge for the sub.