Hey all,

I have 2x 10's powered by a PDX1.1000.
Both subs fire, but one seem to be hitting harder and the other one doesn't seem to be pushing as hard. I have put some poly fill in the box, but I don't think that is the cause. Any ideas.
B/C i am using the OEM head unit there has been "signal" issues. As such I cannot turn the gains up on the amp past 25% b/c there is weird signal feed back and the amp powers off. The is not much bass comming from the sub and I would have expected.

Please share your suggestions.

Thanks!

 

Check for air leaks in the boxes and make sure the polarity is correct, especially with DVC subs.

 

I'd say you probably have the sub wired wrong. Just re-check your connections and make sure they are solid and correctly wired.

 

your Ohms are off. Like your amp might be 4 ohms, but your woofers are at 2ohms.

 

it coulld be leaks..I have screwed and unscrewed the subs quite a bit...
The polarity checks and both subs and amp are 2/4 ohm stable.

 

Are you sure about this? There is a strange opticle illusion that happens when you are off to one side of a box. It will look like one sub is moving more than the other even when it's not.

A few questions:
Are they dual voice coil subs?
What brand and model?
How are they wired? (Series? Parallel?)
Are you sure they are the same impedance?
Did you buy them both at the same time?

 

[QUOTE=n2fooz]Are you sure about this? There is a strange opticle illusion that happens when you are off to one side of a box. It will look like one sub is moving more than the other even when it's not.

A few questions:
Are they dual voice coil subs?: Yes DVC
What brand and model? Kicker Comp VR 10"
How are they wired? (Series? Parallel?) ?? see pic
Are you sure they are the same impedance? .. I am pretty sure they are
Did you buy them both at the same time? Yup..both bought and installed at same time.


I took a good look at it b/c I too though it was just an optical illusion.

 

You're describing two problems. First, you can't turn up the gain or the amp shuts off. Second, the output of one sub is greater than the other. I suspect that the two problems are related. It could very well be caused by wiring the subs incorrectly resulting in either a short or impedence level the amp can't handle.

To me, it sounds like a short in the sub that you say doesn't hit as hard. If one of the voice coils is shorted out, it might play at a low level but cause the amp to go into protect mode when more power is fed to it.

I'd try wiring the sub that seems to be working correctly to the amp by itself in series to see if the noise issue goes away. If it doesn't, try the same with the other sub.

If that doesn't reveal the source, here are some questions heading in a different direction:

1. How/where are you tapping into the stock system for the amp input?
2. Where do you have the amp turn on lead connected?
3. Where is the amp grounded and is it connected to bare metal?
4. What gauge and length of power and ground cables are you using?
5. When the amp shuts off, is the vehicle running?
6. Does the noise you're hearing vary in relation to engine RPM?

 

+1 on checking polarity on your wiring.

 

Is it a common chamber enclosure or are the subs each in their own chamber?
If it's a common chamber, one sub actually may not be working and it may just being pushed by the working sub.

This could cause both problems you are describing. If one sub has a partially shorted coil it could cause your amp to go into protect. Test each sub individually and see if they each play.

 

Doesn't matter with the PDX's. They have a regulated power supply, meaning they put out 1,000w @ 2 and 4 ohms. It can be a tad lower, but I wouldn't recommend it. I ran mine with a sub wired at 1.4 ohms.

 

Check this, as he mentioned it could appear that one sub is hitting harder than the other. A simple test is by pushing the cone slightly on one and if the other moves, then they share they same airspace. If they are in their own chamber then they will move together. Check polarity as others have mentioned.

Just curious, do you have 20A fuses on your pdx or 25A?