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no fighting guys you are both right yes the Kenwood will work fine with the Y adapter and yes I just went ahead and upgraded that unit to a Pioneer and rewired everything and it sounds AMAZING!! Thank you both. Again there was no right or wrong except me taking a week to figure it out.

I'm done

[quote="AmericanPride"]Yes that's a single pre out with a low pass. It will NOT work. You need a new deck period!
.[/quote]

Negative ghost rider.

LPF, low PASS filter.

That means freqs below the x-over will pass through. Freqs above will be cut.

From the Kenwood web site....

Single Pre-out with Low-Pass Filter - A low-pass filter allows the outgoing signal to a connected amplifier to [size=134]filter out midrange and high frequencies[/size]. This is useful for amplifiers powering subwoofers as it keeps damaging mid and high frequencies from being amplified and passed through to a speaker designed to handle only low frequencies.

That deck will work just fine. But you need to check the x-over point on the head unit. Set it to off if you want to use the amps x-over, or around 80hz 24 db if you want to use the decks.

Do what I told you in my last post. You will find the problem.

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

[quote="mamato"]The head unit is a Kenwood-KDC-252U If that helps[/quote]

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.

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

[quote="mamato"]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?[/quote]

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

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

With amp connected

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.

[quote="mamato"]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[/quote]

Did you do that with the amp conencted or without?