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The gain is almost all the way up the bass is all the way up and crossover i messed with didn't matter where it was. And yes the wiring is exactly that way maybe i misleading you they do work just very faint.

mamato wrote:The gain is almost all the way up the bass is all the way up and crossover i messed with didn't matter where it was. And yes the wiring is exactly that way maybe i misleading you they do work just very faint.

I'm still thinking the system is cutting off the low frequencies. I would do what Jeremy said, and get a test tone CD and use a multimeter.
If you don't have that, do you have anything else that you could use for a source for your amp for a test?

If you have a portal stereo, that you can plug the RCA's into from the amp. If you all of a sudden have bass, then you know that your lows are getting cutoff.

If you still don't hear anything, then it's something else.

Yes I took another speaker connected it to a line converter with rca's and same thing it played but not to the capacity it should have

Ok first off, turn the gain down. Gain is not a volume knob, its used to set the input stage of the amp to the output stage of your head unit.

Turn the Bass OFF, and set the x-over around 80 LPF.

Now see how it sounds.

If you don't hear it, disconect the subs at the amp, and touch the leads to a 9 volt battery. Make sure they both move the same way.
If both subs move the same way, leave them disconected, and put in a 40 hz test tone. Start with the volume ALL THE WAY DOWN, and slowly turn it up. If you hear any speakers playing the tone, check the amps output with a DMM. You can turn it up a little to take a second reading, but if you hear any speakers popping or distorting turn it back down.

I have a feeling your amp or one of your subs is dead. That would explain all your problems.

mamato wrote:Yes I took another speaker connected it to a line converter with rca's and same thing it played but not to the capacity it should have

Did you do that with the amp conencted or without?

With amp connected

Well try out the rest of the stuff i told you and let us know what you find.

mamato wrote:I have a 460 mach system with an aftermarket head unit with only 1 set of outputs. the stock system needs an output to run the oem amp so i installed a y dapter to tun an aftermarket amp to power 2 subs. My problem is the subs aren't getting the output I know the can produce, any help?

He said aftermarket head unit with single pre out. Probably a front pre out...not sub.

If he only has the 1 pre out...everything said here is pointless. You need more pre outs

The head unit is a Kenwood-KDC-252U If that helps

mamato wrote:The head unit is a Kenwood-KDC-252U If that helps

Yes that's a single pre out with a low pass. It will NOT work. You need a new deck period!

Get one with at least 2 sets of pre outs and one of them being specifically for a sub out.

I would get a Kenwood Excelon. Great pre outs for the price.

Don't do anything until you get a new deck. You'll spend butt loads of money doing that other stuff, when you could have just got a better deck and been done.

That's all I need to know thank you sir.