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 Question On Bridging?Printed From: the12volt.comForum Name:  Car Audio
 Forum Discription:  Car Stereos, Amplifiers, Crossovers, Processors, Speakers, Subwoofers, etc.
 URL: https://www.the12volt.com/installbay/forum_posts.asp?tid=43148
 Printed Date: October 30, 2025 at 9:24 AM
 
 
 Topic: Question On Bridging?
 
 Posted By: Gcschi22
 Subject: Question On Bridging?
 Date Posted: November 16, 2004 at 7:52 PM
 
 
 Ok i have 2 Dual 2 ohm voicecoil Audiobahn Eternal 12" subs. (1100 rms, 2200 peak) and a boss Pd-4000 watt amp(3000x1 @ 1 ohm, 4000x1 @ 1/2ohm) and i wanted to know that if i bridged the amp down to one ohm, would it distribute 3000 watts to EACH sub, or distribute it evenly? Very confused on the whole bridging thing.  
 
 Replies:
 
 Posted By: Ketel22
 Date Posted: November 16, 2004 at 8:00 PM
 
 it would distribute it evenly....you can run parallel series to get 2ohms or parallel parallel to get 1/2ohm...i don't know how u plan to get 1 ohm...
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 Quad L Handyman services
 
 
 
 Posted By: kfr01
 Date Posted: November 16, 2004 at 8:25 PM
 
 And not to be a jerk, but I'd be VERY skeptical about that amp actually pushing a clean 3000x1 @ 1 ohm without frying itself in a matter of months. 
 Run it at 2-ohms. Your ears will thank you. The amp probably won't break.
 
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 New Project: 2003 Pathfinder
 
 
 
 Posted By: Gcschi22
 Date Posted: November 16, 2004 at 8:28 PM
 
 Im a noob with this, this is actually my first system. So i wont be able to run at 1 ohm? 3000x1? 
 
 
 Posted By: Ketel22
 Date Posted: November 16, 2004 at 8:30 PM
 
 check out the series/parallel calculators available on this site. mess around with them and educate urself a little bit about ohms law it will come in handy. no you won't be able to get a 1ohm load using both subs. only a 2ohm load or a half ohm load.
 -------------
 Quad L Handyman services
 
 
 
 Posted By: Gcschi22
 Date Posted: November 16, 2004 at 8:33 PM
 
 Is that because the subs are dual 2 ohm Vc? What kind of amp would you recommend thats chepa and powerful to run the subs? 
 
 
 Posted By: Gcschi22
 Date Posted: November 16, 2004 at 8:43 PM
 
 Why wont i be able to get a 1 ohm load between the 2 of my subs?  
 
 
 Posted By: haemphyst
 Date Posted: November 16, 2004 at 8:46 PM
 
 OK...  first off, to the amplifier.  That amp only has 4 30A fuses in it, so it's maximum safe input current is 120 Amps, right?  120A X 14.4V = 1728watts IN!  I want to know HOW IN THE HELL are you going to get 4000 watts out of a device when you are putting only 1728 watts IN (and what about the losses? is it a class D amp - at best 95% efficient - 1641 watts out, class AB, 50% efficient - 864 watts out)  In typical Boss fashion, they are playing the BULLsh*t card, and they SAW YOU COMING!!!  Did you get a kiss?  This is why I say NEVER BUY those mass market, slave labor, chinesawan, import garbage, amplifiers.
 Now, to the possible loads with the drivers you have...  4 two ohm voice coils will net 8, 4, 2 or 1/2 ohm loads.  If you are going to bridge this amplifier, and you want maximum output (shyah, right) you will have to go to the 2 ohm setting, which will be the voice coils on each woofer in series (2 + 2 = 4ohms) then parallel the two woofers (4 / 2 = 2ohms), then you can bridge the amp, for a net load of one ohm per channel.  This will give you 3000 watts (see previous paragraph) and an overall efficiency from your amplifier of 173.6%!  SWEET!  Boss has figured out the answer to "power from NOTHING"!!!
 
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 It all reminds me of something that Molière once said to Guy de Maupassant at a café in Vienna:  "That's nice. You should write it down."
 
 
 
 Posted By: stevdart
 Date Posted: November 16, 2004 at 8:49 PM
 
 Here .............taker Ketel's advice. ------------- Build the box so that it performs well in the worst case scenario and, in return, it will reward you at all times.
 
 
 Posted By: Gcschi22
 Date Posted: November 16, 2004 at 8:51 PM
 
 What do you suggest then? cuz obviously your a genius when it comes to all this.. so help me out? what do u suggest? 
 
 
 Posted By: Gcschi22
 Date Posted: November 16, 2004 at 8:59 PM
 
 Suggestions? 
 
 
 Posted By: Gcschi22
 Date Posted: November 16, 2004 at 9:00 PM
 
 Suggestions? All of that is confusing to me considering im a newbie.. So any suggestions would be appreciated. 
 
 
 Posted By: kfr01
 Date Posted: November 16, 2004 at 10:27 PM
 
 If you just want to be told what to do then run it at 2-ohms. It will push a few hundred watts to each sub and it will be plently loud. If you're trying to compete or somehow feel you actually need 3000watts - which is an insane amount of power - then be prepared to spend money on decent brands. 
 This: https://www.cardomain.com/item/JBLBPX22001
 Is an example of an amp that can actually put out around 2000watts. It is $1500. JBL is not known as an expensive brand. Boss is known as a very cheap brand that is less than honest with its ratings. Whatever you paid you were ripped off in my opinion. 
 Do some reading at https://www.bcae1.com/  If you want to understand the post that hympyst made.  ------------- New Project: 2003 Pathfinder
 
 
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