Sub not getting enough power

[IllustratedMan]

Summarized, I installed a sub and amp and the sub is not getting enough power.

I am using Sony XPLOD XM-1652Z 2 CH 1000 W 2/1 Channel Amplifier XM1652Z DAKmart.

As well as JackHammer JH4512-04 12" Single 4 Ohm Subwoofer | shop.mtx.com.

According to my manuals as well as these websites, the jackhammer is 250 RMS-500 max at 4 ohms. The amp says 400 watts bridged at 4 ohms. Barely any sound is coming out. I went through a list in my head of things that could be wrong.

1. Poor grounding- I believe the metal I grounded the amp to in the trunk was welded, but I know the screw goes beyond that, touching the metal base of my trunk. Not sure how big of a problem this is.

2. I am using a cheap Line-Out Converter- I was told to get an aftermarket head unit because the sound quality will increase tremendously, but would it affect the amount of power the sub receives? Also, the LOC is tapped into my stock bose amp which I believe is 1 ohm. Would that matter?

3. Both my power and ground are 4 gauge. The speaker wire is 14 gauge.

What's the deal?//content.invisioncic.com/y282845/emoticons/help.gif.cee8f684da1ba626487a8bc51152e1ec.gif

Click to read more...

 

[Oh6AcCoRd 10+ year member]

get an aftermarket head unit.

 

[sobe3yourself. 10+ year member]

check your gains?

 

[IllustratedMan]

check your gains?

I twisted the knob between .3 and 6V, if that's what you mean. It got noticeably louder, and by noticeably i mean it went from not making any noise to making just enough noise you know that's it's on.

 

[Kastlez_ 10+ year member]

You're wiring or settings are incorrect somewhere

 

[CHEMMINS 10+ year member]

Also, the LOC is tapped into my stock bose amp which I believe is 1 ohm. Would that matter?

Do not go off of that......

And yes...LOC's lick balls. Get a real hu