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5 stage band pass sub box, 1 sub stolen, box built to spec subs

I had a very exp. comp. spec. box built for 2 older rockford power 12" subs the chrome donut magnet model. This box was specd for these subs 1 got stole, can I somehow match a new comp. sub to this box design and spec or do I need to find one of these subs to replace missing one. or can you cut the mirror image band pass box in half and wall it up to make a single spkr box?

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I would try walling it up unless you are going to buy 2 brand new subs. the problem is the older power subs had such small magnets so they needed alot less air space inside the box. Unless you can find the EXACT subs this box was made for I would recommend chopping it and doing a single sub. if you try a replacement sub go with the 12" P1 series they are a close match for the power 12's of the past.

Posted on Mar 08, 2009

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Posted on Jan 02, 2017

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What kind of amp can adequately power P112 S8 subs


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Need to build a ported sub box for my alpine swr-1222d subs x 2


Try going to Alpine web site, I think they have box building program as well that you just input your sub models into and it gives you blueprints for various types of enclosures. I know Rockford has one and a comparative attachment to compare equipt specs. Or if you call Alpine headquarters you may be able to get info that way, I once sweet talked a rep @ a demo vehicle I met doing some car shows that turned me on to a senior rep @ Korbon Trading the owners of Rockford Fosgate and they gave me specs for a 5 stage band pass box for some competition subs that was more intricate and detailed than anyone before that could find me, Won me first place in spl. Matching your box specs to your subs is crucial and the best specs are often kept a secret for demo competition vehicles! So ask around with some competition guys or other top experts if your real serious about your boooom.

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there is nothing wrong with the Rockford amp it just wont pound out the bass as hard but the good news is you will never blow the subs with it
when buying amps or subs make sure to look at rms rating that is the true power they actually have ie. (sub box says 1200 watt you think powerful but if you divide it in 1/2 you actually get 600 watts rms) don't get me wrong that's a nice rating. for a sub but you will want to match that number with the amps rms rating or lower. The RMS is what makes the car pound the higher the RMS the better
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4 Answers

Orion hcca 250


i can make this relatively simple.
2 stages:
Stage (1) wiring the Sub inside the box;
Unscrew the SUB from the Box, (& undo the wires)
Connect both +Positive terminals on the SUB to the +Positive terminal on the inside of your BOX.
Connect both -Negative terminals on the SUB to the -Negative terminal on the inside of your Box,
Then screw the SUB back into the Box.
u Have just wired yr sub in parallel. any Amplifier will see it as 1woofer with 1OHMs resistance.

Stage (2) bridging your amp
(please check Amplifier instructions on which terminals to use)
generally you use "LEFT -Negative" and
"Right +Positive"
and connect to the corresponding terminals on the Sub Box.
Hope that helps someone.

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1 Answer

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1. no all amps can go bad with a bad installer !
2. repairs sometimes go for as much as it was new! so somettimes not worth it!
3.1 12 4ohm would sound lot better i reccomed mono amps for subs being they only put out low feqz and are better and more battery effient!

Feb 21, 2009 | Car Audio & Video

1 Answer

My Amp


sounds like the sub that throws it into protect mode is cross wired pull sub out and make sure they are wired right make sure ground from sub goes to ground on box and do same for power wire

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