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Ohms if i have two 3.3 ohm subs what will be the impedance

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If you put the 2 in series you will get 6.6 ohm's of impedance or if youput them in parallel you will get 1.65 ohm's of impedance.

Posted on Nov 30, 2006

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What is the best way to wire two kicker comp r 12' s to a two channel amp for max bass?
First, you need to know whether you have the 2 ohm DVC subs or 4 ohm DVC subs. Second, you need to know the minimum impedance the amp can handle (most are 2 ohm, some are less). Putting two voice coils in parallel will cut the total impedance in half (e.g. 2x 4 ohm voice coils in parallel = 2 ohms total). Putting subs in parallel will also cut the impedance in half.
At one end of the spectrum, you could put the 2 ohms DVCs in parallel, then parallel the two subs, and bridge the 2 channels of the amp. That would put 0.5 ohms impedance on the 1 bridge amp channel. If the amp can do 0.5 ohms x 1ch, do it. Otherwise, you may have to run the subs on separate channels.

Oct 23, 2015 | Kicker Car Audio & Video

1 Answer

I have a amp with switch that says high power & high current
The ohms rating measures the electrical resistance of the subs(impedance). On the subs there is usually a label that tells you what the impedance is for that particular sub,example= 4 ohms . The only way you can get to a 1 ohm load or less with a pair of tens is if each sub has dual voice coils that are 4 ohms each wired in parallel. Generally Sony xplod's are a single coil 4 ohm woofer-yours might be the exception in this case .To figure out your resistance say with 2 subs that are 4 ohms you have to know how you intend to wire them for instance if your amp puts out a fair amount of power @2 ohms and thats the number you want to hit than you will want to wire the subs in parallel( + to + and - to -) wiring in parallel lowers the resistance.(ohms) If you want to hit 1 ohm and you have dual 4 ohm coils then wire all 4 coils in parallel and that will then be a 1 ohm load. Its simply a matter of dividing the ohms by the number of speakers that you intend to connect. if you had 3 10s that were 4 ohms each and you wired them in parallel the ohms would be 1.33 (as 4 divided by 3 is 1.33)(4 divided by 2 is 2) (4 divided by 4 is 1) On the flip side wiring in series will raise your impedance-a pair of 4 ohm subs wired in series gives you an 8 ohm load 3 subs gives you 12 ohms and so on. I wouldnt worry about the high current switch unless youre planning on taking it down below 1 ohm which it sounds like you arent currently set up for.

Jan 31, 2010 | MB Quart RWE 352/354 15" DVC Subwoofer Car...

1 Answer

How 2 wire 3 jl audio w6 v2
Hello mikey4569mky,

Unless your amp is stable below 1 ohm, there's really only one wiring solution. And that is to series the voice coils making each sub 8 ohms, then parallel all 3 subs to the amp for a 2.67 ohm load. If you parallel the voice coils and then parallel the subs, the impedance will be 0.67 ohms, much too low for most amps.

You could parallel the voice coils and then series the subs for a 6 ohm load, but the amp won't put as many watts into a 6 ohm load. Most are optimized for 4 ohms or 2 ohms. And it's not good to run subs in series anyway.

Here's the wiring diagram.

Hope this helps.

Sep 13, 2009 | Jl Audio 12W3 Car Subwoofer

2 Answers

I have 2 positives and 2 negatives on back of my alphasonik sub, do i connect amp to one side or both sides?
Hello gaz69,

Your PSW815 has 2 ohm dual voice coils allowing you to better match the impedance to your amp. Each voice coil is 2 ohms. If you wire them in parallel (both +'s together and both -'s together and then to the amp terminals), the sub presents a 1 ohm load which is too low for most amps. Wiring the voice coils in series (one + to the other - and the remaining + and - to the amp terminals) results in a 4 ohm load.

This link shows the wiring diagram for both options. If you know for sure that your amp is 1 ohm stable, use Wiring Option #1. If the amp is not 1 ohm stable, use Wiring Option #2.

Hope this helps.

Aug 09, 2009 | Alphasonik PSW815 Car Subwoofer

1 Answer

I have 3 hifonics zeus Size: 12 inch Impedance: Single 4 Ohms Peak Power Handling: 800 watts RMS Power Handling: 400 watts Sensitivity: 89.9 dB Aluminum Cast Basket American Spider For Reliable Performance...
Hello king3132,

Three 4 ohm subs can be wired parallel for a 1.34 ohm final load or series for a 12 ohm load. If you have the channels of the amp bridged, I hope that the subs are connected in series because the Sony XM-2200GTX is NOT rated for or stable at 1.34 ohms. It's only stable down to 4 ohms.

You definitely will not get the maximum potential of the subs from that amp. They can handle 400 watts RMS each (total 1,200 watts) and the amp is only capable of 500 watts RMS into 4 ohms (less at higher impedance), so each sub could only be getting a maximum of 166.6 watts RMS.

Hope this helps.

Jul 20, 2009 | Digital Audio Car Audio & Video

1 Answer

Subwoofer Dual voicecoil wiring
1 ohm will draw too much current.those are designed for a 2 channel 2 ohm drive for each sub.running 4 ohms will be easier on the amplifier and since impedance is not constant it may run 3 ohms at some frequencies anyway. another solution if your power amp is bridgeable....put the coils in series on each woofer making 4 ohms.then parallel the two 4 ohms to make 2 ohms and run the amp in bridge mode at 2 ohms.since bass is omnidirectional,you can do it

Jun 13, 2009 | PPI DCX-500.2 Car Audio Amplifier

1 Answer

Ohm calculations; 4 and 8 ohm sub woofer?
+ output from amp to + input of 4 ohm to + input of 8 ohm AND - output from amp to - input of 4 ohm to - input of 8 ohm is a parallel circuit = 2.66 ohm impedance load for amp
+ output from amp to + on 4 ohm - on 4 ohm to + on 8 ohm - on 8 ohm to - of power amp is a series circuit = 12 ohm impedance load for amp. Clear as mud??
Clear as mud?

Jun 11, 2009 | Jl Audio 12W0 Car Speaker

1 Answer

Sub Wiring
Hello jtkpay,

Rockford-Fosgate claims their latest V-power 1500bd is stable to 1 ohm, and I would think that your Oldschool would also be. The 2 wiring options for 3 subs with 2 ohm dvc would give you a 1.34 ohm load and a 3 ohm load. The 1.34 ohm option would mean more watts to the subs, but the amp will run hotter. The diagrams look like this:

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Using just 2 of the Kickers, you can wire 3 different ways, with final impedances of 0.5 ohms, 2 ohms, or 8 ohms. You do not want the 0.5 ohm load. It's bad for the amp. You don't want the 8 ohm load. It doesn't allow the amp to produce as much power. So that leaves only the 2 ohm, with coils in series and subs in parallel. It looks like this:

97d7e1b.gif
Hope this helps. If it does, please rate as "FixYa".

Apr 27, 2009 | Rockford Fosgate Power 1500BD Car Audio...

1 Answer

Heating up and clipping
A number of things could be wrong. First off, how do you have the 3 subs wired that will actually give you 2 ohms? For instance, if you had 3 single voice coils and they were each 4 ohms You would be sitting around 1.5 ohms. Or if they were dual 4 ohm subs then you could have wired the voice coils in series then the subs in parallel and came up with about 3 ohms. Unless the kickers have an odd impedence then there is no way you have 2 ohms from the subs to match the 2 ohms at the amp. So what I would do is try to match the impedence as well as I could. Also, make sure the amp is well ventilated. do not screw it directly down to a surface, put some 1/4" spacers on the screws so some air flow can get under the amp also. I hope I could help. Good luck
-Andrew Hawkins

Jul 14, 2008 | Kenwood KAC-9152D Car Audio Amplifier

2 Answers

Dual voice coil wiring to class d amp
The easiest way to think of wiring voice coils and subs is this:
  • Two items of the same impedance in parallel = Half of the impedance
    • 4 ohms in parallel with 4 ohms = 2 ohms
    • 8 ohms in parallel with 8 ohms = 4 ohms
  • Two items of the same impedance in series = Double the impedance
    • 4 ohms in series with 4 ohms = 8 ohms
    • 8 ohms in series with 8 ohms = 16 ohms
In this case, you want to wire two subs, each with dual 4 ohms voice coils, so that the total equals 2 ohms. Your options are:
  • DVCs in parallel, 2 subs in series = 4 ohms
  • DVCs in series, 2 subs in parallel = 4 ohms
  • DVCs in parallel, 1 sub = 2 ohms
With two, dual 4 ohm subs, you can only have 1 ohm or 4 ohm total impedance.

Mar 16, 2008 | Car Audio & Video

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