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  #1  
Old 06-28-2008
truckcap22's Avatar
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wiring help!

alright i got a powerbass 2 channel amp its the extreme model xa2150 so it should have plenty of power to run 3 12"s

anyway for the subs i have 2 12" dual rated at 1100w for the pair and a jl w3
and the duals have the single port for wiring both subs

but when i wire all the subs up together it seems like it gets less power then when you just have either the duals wired up or the jl??

doesn't make since what should i do to fix this or just buy another amp?
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Old 07-01-2008
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why do you need so many subs?
but yea get another amp if you must have them all
your also gonna have a bad whine in the speakers expicaly when you run the AC
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Old 07-01-2008
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i have never had a whine in my speakers
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Old 07-01-2008
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well then you must not be using to many amps off the alternator
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Old 07-01-2008
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well i been pulling plenty off the alt and i have never had a whine but it might be because i also have a optima maybe
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Old 07-01-2008
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All my whine came from a rusted ground, took a grinder and cleaned it up and stopped all the whine from my 2 l7s...I also have to kenwood 1000 watt amps grounded to the same ground...and from my personal expirence mixing subs usually ends in bad sound quality
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Old 07-02-2008
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Quote:
Originally Posted by timpat92855 View Post
All my whine came from a rusted ground, took a grinder and cleaned it up and stopped all the whine from my 2 l7s...I also have to kenwood 1000 watt amps grounded to the same ground...and from my personal expirence mixing subs usually ends in bad sound quality
true true...
i have an optma but iv only niticed the whine with the 3.0 in my 4.0 i didnt
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Old 07-02-2008
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What's the ohm rating of the speakers?
Are they single or dual voice coil subs?
How are you running the 2 channel amp? Bridged?
What is the power rating of the amp at 2ohms? 4ohms?

You are correct in that the subs will each get less power when all three are connected because they are sharing the power divided by 3 instead of two or just one. And, just a heads up- be careful not to wire the subs into too low of a load (ie 1ohm or 2ohm) if the amp can't handle those kind of impedances. Most amps in bridged mode are only stable to 4ohm; however, some are stable at lower.

Just my opinion, mixing brands of subs is not usually done because it can sound like poo poo. I might be tempted to run one brand or the other.

Last edited by seminaryranger; 07-02-2008 at 11:53 AM. Reason: clarify
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Old 07-02-2008
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The difference in the 3.0 and the 4.o could be in the way ford made the grounds in the engine compartment...i know on some vehicles the whine is jus awful even with a good ground and can take the same setup to another car and it will sound perfect..
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  #10  
Old 07-09-2008
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i ended up just buying a dual amp and ran the 2 duals off that and the powerbass for the jlw3 thanks guys
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