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4 subs to 1 two channel amp

Printed From: the12volt.com
Forum Name: Car Audio
Forum Discription: Car Stereos, Amplifiers, Crossovers, Processors, Speakers, Subwoofers, etc.
URL: https://www.the12volt.com/installbay/forum_posts.asp?tid=46309
Printed Date: April 29, 2024 at 8:15 AM


Topic: 4 subs to 1 two channel amp

Posted By: 01xtreme
Subject: 4 subs to 1 two channel amp
Date Posted: December 29, 2004 at 5:07 PM

I have 4 audiobahn 12's, which are dual 4 ohm.  They operate in either 2 or 8 ohm loads.  I have a 1600 watt power acoustik amp, which is only 2 channels.  I have been told to wire 2 subs to each channel in series wiring.  I would like to operate in 2 ohm loads for max. power.  2 of these subs hooked up to my old 1200 watt amp in parallel hit 143.3 db.  I dont really know how to wire in series for my application.  sorry no pics at time.  any information would greatly be appreciated.  I am building a custom box for my s10.   4 12's + 1600 watt amp= very loud.  Thanks.

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01 extreme



Replies:

Posted By: OCURIEL
Date Posted: December 29, 2004 at 5:24 PM
Can you list the amp specs?




Posted By: wheelerdr
Date Posted: December 29, 2004 at 5:36 PM

if your amp will go down to 2 oms bridged (which is not likely) then run two sets subs in series this will give you a set of two at 4 ohms and the other set of 2 at 4ohms now you can run this to each channel or run these 2 in parallel in to the amp and you will have one setup with all 4 at 2 ohms



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Posted By: 01xtreme
Date Posted: December 29, 2004 at 5:41 PM
the person who told me how to wire this originally told me not to bridge the amp( which I couldnt anyways)  How would I wire all 4 in parallel to 2 channels?  Any pics would greatly help.

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01 extreme




Posted By: 01xtreme
Date Posted: December 29, 2004 at 5:50 PM
  • FULL MOSFET POWER SUPPLY
  • PWM CIRCUITRY
  • FULLY-SELECTABLE CROSSOVER (HI/FULL/LOW)
  • 3-WAY PROTECTION CIRCUIT
  • 2W STABLE STEREO
  • TRI-MODE CAPABLE
  • VARIABLE LOW PASS: 40 HZ-120 HZ
  • VARIABLE HI PASS: 150 HZ - 1.5 KHZ
  • 18 DB BASS BOOST @ 40 HZ
  • FREQUENCY RESPONSE: 10 HZ - 30 KHZ
  • S/N RATIO: 97 DB
  • THD: 0.02%
  • SYSTEM DISTRESS INDICATOR
  • HIGH/LOW LEVEL INPUTS WITH FLOATING GROUND
  • 4-GAUGE POWER/GROUND CONNECTION
  • GOLD-PLATED RCA CONNECTORS
  • LINE OUTPUT
  • 4W RMS: 310 X 2
  • 2W RMS: 370 X 2
  • MONO RMS: 740
  • BRIDGED MAX: 1600


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    01 extreme




    Posted By: OCURIEL
    Date Posted: December 29, 2004 at 6:14 PM
    I would bridge the amp & wire all 4 subs to make the amp see a 4 ohm load. I'll try to post a pic of the wiring.




    Posted By: Sancho
    Date Posted: December 29, 2004 at 6:30 PM

    posted_image

    that's the only option



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    Head Unit:Alpine CDA 9835
    6.5 MB Quart Pce 210
    Amp:JBL 80.4
    Amp:JBL 1200.1
    Sub:Adire Brahma 12 MKII




    Posted By: forbidden
    Date Posted: December 29, 2004 at 6:58 PM

    Here is the other and safer option. Note that this diagram is for one channel and two subs only, thus duplicate it for the other side. Your amplifier is not going to be 2 ohm mono stable and if it is wired as recommended above, you will be buying a new amp in short order.

    Wiring Option #2
    posted_image



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    Top Secret, I can tell you but then my wife will kill me.




    Posted By: Ravendarat
    Date Posted: December 29, 2004 at 8:44 PM
    Rob has it right here. The amp is not 2 ohm MONO stable only two ohm stereo stable. So running 4 ohm stereo is the only sane way to do this. Honestly its not reall a good match but this is the best way to work with what you have.

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    double-secret reverse-osmosis speaker-cone-induced high-level interference distortion, Its a killer




    Posted By: dedlyjedly
    Date Posted: December 29, 2004 at 9:05 PM

    (THOSE) 4 12'S + (THAT) 1600 WATT AMP = A SYSTEM THAT DOESN'T PERFORM AS WELL AS YOUR OLD ONE!!!

    don't believe me.....well...read on

    okay, here's the deal...forbidden is in fact correct with his diagram above. obviously you will have 2 subs connected in this manner to EACH channel of the amp, hence we refer to the final load as "4 ohm stereo". forbidden was most likely correct (i have not confirmed) in assuming that the power akoustik will not handle a "2 ohm mono load". thus, the minimum stable load is "4 ohm mono".

    i know im starting to confuse everyone, so my logic above amounts to the fact that you'll ONLY utilize all 1600 watts (peak by the way) @ a 4 ohm mono load!

    the 4 ohm stereo load you will use will only yield HALF of the amp's potential!!!!

    so instead of running 600 watts peak (i can only assume your old amp liked to exagerate power as well) to each sub like you had before, youre attempting to run 400 watts peak to each.

    unless you were seriously overpowering the subs previously, i suggest a different amp (something that will deliver the power you want @ 2 ohm mono)

    i know this sounds rediculous to some of you, but designing an efficient system is a lot more difficult than maximizing the watts!



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    MECP certified, 5yrs experience, you probably otta listen bitch!!




    Posted By: uthinkuknoaudio
    Date Posted: December 29, 2004 at 9:32 PM
    Well, you can either achieve 0.5 ohm load or a 2 ohm load if you want to run it bridged, but that would be extremely inefficient since the mono is 4 ohms. Therefore, the only right way to do it is to wire each up into 8 ohms, then run two per channel. splitting the impedance down to 4 ohms each. You'd only get 310 W x 2 @ 4 RMS. That won't give you enough power. That isn't good because power acoustik is overrated as it is... maybe you should consider a bigger amp. It would be worth the investment and would make the world of difference to your stereo system. A good budget amp company is JBL, in which some of their products might interest you. They are great and are worth the money, but more importantly will give you the power and good clarity that you need. www.jbl.com

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    "I don't play games. I play Nakamichi and that for real yo" - Probably some japanese kid said this in the early 80's trying to sell stereo out of his trunk lol.




    Posted By: Ravendarat
    Date Posted: December 30, 2004 at 10:43 PM

    dedlyjedly, I think you underestimate the people on this board. I got news for ya, most of the people on this board arent going to get cofused by your simple little explination about running amps in mono and stereo and what this does to your power. Infact I dont think your post really said anything that wasnt already said earlier. I am gonna trust that you didnt mean anything by your post but it seemed very condesending and I cant think of anything I hate more than people talking down to me about things that are the equivelent of the ABC's to me. I am betting most of the other people feel the same way as me. Like I said though, I am sure you didnt mean it that way, right posted_image



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    double-secret reverse-osmosis speaker-cone-induced high-level interference distortion, Its a killer




    Posted By: auex
    Date Posted: December 30, 2004 at 10:49 PM
    I'm confusedposted_image

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    Certified Security Specialist
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    I've been sick lately, sorry I won't be on much.




    Posted By: supradude
    Date Posted: December 30, 2004 at 10:57 PM
    Now that I think of it, Ravendarat, it sort of sounds like he did mean it that way! But maybe not?

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    '85 Toy




    Posted By: audiobass10
    Date Posted: December 31, 2004 at 12:08 AM
    I'm with Ravendarat...this isn't a forum full of newbies and you didnt say anything complicated..in fact you didn't say much of anything.

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    Dave

    Pioneer Premier DEH-P660
    15" Kicker CVR
    Profile AP1000M
    It's Loud




    Posted By: dragonrage
    Date Posted: December 31, 2004 at 4:09 AM

    Instead of putting 4 ohms on each channel in stereo mode, put an 8 ohm load in mono on. You're not going to get much for power, though. You can't just run a ton of speakers with a crappy amp.

    And since when is half of 600 equal to 400?



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    2009 Pontiac G8 in planning stage
    HU: ?
    Speakers: ?
    Amps: ?




    Posted By: OCURIEL
    Date Posted: December 31, 2004 at 12:09 PM
    I want to apoligize for my stupidity. I was wrong when i said you can wire 4 4 ohm dvc subs to make the amp see 4 ohms. posted_image




    Posted By: uthinkuknoaudio
    Date Posted: December 31, 2004 at 5:18 PM
    Ravendarat is 100% on target. We know this stuff like the ABC's so don't go insulting our intelligence by filling us with your garbage. Keep the posts clean and to the point.... Wire it all to 4 ohms if you are going to do it sanely. Equation: (4+4)(4+4)/2=1 channel @ 4 ohms. Do that twice and voila you are set. You might not have a lot of power, but it is the only sane way to do it.

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    "I don't play games. I play Nakamichi and that for real yo" - Probably some japanese kid said this in the early 80's trying to sell stereo out of his trunk lol.




    Posted By: dedlyjedly
    Date Posted: January 04, 2005 at 8:38 PM
    dedlyjedly wrote:

    (THOSE) 4 12'S + (THAT) 1600 WATT AMP = A SYSTEM THAT DOESN'T PERFORM AS WELL AS YOUR OLD ONE!!!

    ...i know im starting to confuse everyone, so my logic above amounts to the fact that you'll ONLY utilize all 1600 watts (peak by the way) @ a 4 ohm mono load!

    the 4 ohm stereo load you will use will only yield HALF of the amp's potential!!!!

    unless you were seriously overpowering the subs previously, i suggest a different amp (something that will deliver the power you want @ 2 ohm mono)

    i know this sounds rediculous to some of you, but designing an efficient system is a lot more difficult than maximizing the watts!


    sorry for the delayed response, i was enjoying new years in steamboat colorado.

    well gentlemen...let me begin by saying that my intent was not to belittle anyone or offend anyone.  i enjoy helping others in this forum ALMOST as much as finding the answers to my questions here! that said, i used the language and the format above in order to stress a point.  although others had hit the nail on the head w/ the ohm's law mumbo jumbo, i wanted to interpret what the truly meant to the threadstarter.

    and i stress again, he probably wont be satisfied with the time and money invested and the space sacrificed for the larger enclosure when he hears the system as described.

    i stand by my opinion, but am sorry that that message was unclear in my original post.

    there are many members here who are proficient in mobile electronics, and my post was not intended for them. 

    well...i just seem to ramble, so hope the holidays treated you all well, im off to CES and will most likely not be around for a while, yep, i'm "OUT" like a fat chic in dodge ball!



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    MECP certified, 5yrs experience, you probably otta listen bitch!!





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