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What did we do wrong?

Old 08-21-2004, 05:47 PM
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My friend and I installed in his car today 2 Pioneer Premier 12" DVC subs, and a kenwood subwoofer amp. I have the subs voice coils wired in parallel, and the subs wired in parallel so the amp is seeing a 1 ohm load, which it is stable for.

The deck doesn't have a subwoofer preout, just 1 regular set of preouts. We got everything hooked up fine, we think. So, we play some music, and more bass is coming out of his front speakers than is out of the subs
Another thing, the subs are moving quite a lot, lots of excursion. I set all the settings on the amp right, gain is set at half.

The amp has 2 gains though, supposedly one is for the RCA's? I only used the main ground beside the power. I've never heard of grounding RCA's. DO you think this is our problem?
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Old 08-21-2004, 05:53 PM
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Is this in a ported box? does the amp have a built in subsonic filter?
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Old 08-21-2004, 06:09 PM
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Double check the amp settings, then make sure the subs are not out of phase with each other.
Make sure any adjustments on the HU are correct for your setup.
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Old 08-21-2004, 06:13 PM
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Yup, sounds like an out of phase issue with the subs. One sub is moving in while the other is moving out. If you have really good eyes and are stoned enough, you can actually see them moving in opposite directions. The subs can infact be wired out of phase and still present a 1 ohm load to the amp. Disconnect one sub and see if it is louder. This will tell you right away.

No the secondary ground lug is not the problem.
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Old 08-21-2004, 08:29 PM
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Thanks guys! I forgot about the out of phase issue. I'm pretty sure I wired them up right but I will double check for him tomorrow.

Audiorookie: Yes, ported box, and yes, the amp has a subsonic filter, I have it set at 15 hz.
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Old 08-21-2004, 09:39 PM
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Definately out of phase...Make sure your wires are labelled right...one easy way to check is to get a AA or 9 V battery and solder a pigtail on each end. Disconnect the sub speaker wires from the amp and touch the positive pigtail to the wire which you think is the positive speaker wire, and the negative pigtail to the negative side of that speaker wire pair at the same time.

Now if the cone of the sub moves outwards, you know that your wires are labelled correctly. If the speaker cone moved inwards the wires are incorrectly labelled. Of course do this for each sub and voice coil(Sometimes manufacturers will mislabel the terminals on the sub and cause you to wire the sub up backwards due to no fault of your own).

Then wire it correctly at the amp (sum up all positive wires together and the negatives together as well to the bridged terminals)and you're all good!!
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Old 08-22-2004, 12:58 PM
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Well, turns out we did have it wired wrong, through fault of my own. But we re-wired it today, and it pounds pretty good.





[ August 22, 2004, 02:12 PM: Message edited by: Dustin W. ]
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Old 08-23-2004, 05:07 PM
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holy cow! how long are those rca's?
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Old 10-25-2004, 05:18 PM
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far too long as you can see.
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