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What is the difference in a dual 2 ohm sub and a dual 4 ohm sub?

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Dual 2 ohm sub can be wired to achieve a 1 or 4 ohm load.
Dual 4 ohm sub can be wired to achieve a 2 or 8 ohm load.

Usually no difference in Theile Small Parameters.... Only wiring configuration - to get the most power out of your amplifier.

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Posted on Feb 24, 2009

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Both subs quit at the same time


- kkkjohnson - Please clarify your question. Do you mean they stopped working all together.
-First make sure the amp going to the subs is still working. -If not, stop and trouble shoot the amp (fuse, loose wires,etc) -If it is working, check the wires going from the amp to the subs -If the wires are connected, your next step should be to dismount the subs and hook them up to a digital multi-meter (DMM) To use a DDM to test the subs ohms do the following:
Figure out what the specs of you subs are...ie...what ohms and voice coils the are (dual 2 ohm, 4 ohm, etc. After that, place the black/negative wire/lead coming from the DMM tol the negative terminal of the sub. The place the red/positive wire/lead to the positive terminal of the sub. Then set the DMM to the ohm symbol. It should look like a horse shore symbol. Then allow 5 or 15 seconds for a accurate reading of what the ohms are. For instance a dual 2 ohm sub should read anywhere from 1.6 ohms to 2.4 ohms...each sub is difference. Check both sides/voice coils if it is dual voice coil subs. For instance if your sub is dual 2 ohm sub and you get a read that is higher than the numbers listed above (ex. 8 ohms, .05 ohms, etc); this would indicate that you have a blown sub.

Oct 14, 2012 | Kicker Comp CVT 10 Car Subwoofer

1 Answer

I have 4 mtx 9500 12in subs 2 of them is on a mtx 92001 and the other is on a mtx 4001d . would it be better to run all four on the mtx 4001d. for more power and a better sound or how should i run this set...


NEVER mix different power amps. Depending on the ohms of your subs, sell one of the amps, up to you. The 4001 has more power, but either amp will do the job, the amp needs to see a 1 ohm load, so your subs have to be dual 2 ohms, or single 4 ohms to do this. If your subs are dual 4 ohms then you will have to run your amp at 2 ohms which would be have the power, or a half an ohm, (Not Recomended) and be at double the power. You may be able to do a competion sound off and just "Burp" the subs, but at a half an ohm, dont expect to listen to it to long before it goes into protect and shuts down.

Sep 06, 2011 | MTX Thunder Elite TE4001D Car Amp

1 Answer

What's the best way to hook up 2 Hifonics hdl12d4 subwoofers to a mono amp


Ok, your post has two different models listed. Let's start with something you need to know about your amplifier. Is it one ohm or two ohm stable. This will make a difference. Also, whether your subs are single voicecoil (HFI12s4) or dual voice coil (HDI12d4).

Let's start with the easy scenario. Let's say your amp is two ohm stable and you have two single voice coil subs. It's simple. You go from the positive of the amp to the positive of both subs and the negative of the amp to the negative of both subs. This will provide a 2 ohm load to the amplifier, thus pulling all the power out of it.

Unfortunatley, if you have two dual voice coil subs, you won't be as efficient. You will only have the options of a 4 ohm load or a 1 ohm load.

This is where having a one ohm stable amp would come in handy. If the amp is one ohm stable, hook the positive of the amp to all 4 of the positives on the subs, and hook the negative of the amp to all 4 negatives of the subs. This produces a 1 ohm load.

WARNING!! If you have a 2 ohm stable amp DO NOT use the last wiring scenario. It will fry your amp.

Now, the last is a little trickier. This is for two dual 4 ohm subs. Follow closely. Hook the positive of the amp to one of the positives of each sub. (do the next step to both subs) Go from the negative of the voice coil that you hooked positive from the amp is hooked to, and hook that to the positive of the unused voice coil. Then go from the negative of that voice coil and hook to the negative of the amp. Make sure this is done on both subs. This will give you a 4 ohm load.

Hope this helps

Aug 31, 2011 | Hifonics HFI 12S4 12 DVC Subwoofer 600...

1 Answer

What kind of amp to buy for an alumapro 10 inch sub 4ohm 250watts rms?


Is your sub single or dual voice coil. This will also make a difference in choosing amps. Pretty much any amp that will supply your required power will do. But, if you have a single voice coil sub, you will be wanting to look for RMS power at 4 ohms. If you have a dual 4 ohm voice coil sub, you can wire it to a 2 ohm load. Then you will need to search for amps that supply the RMS requirements of the sub at 2 ohms. The choices are almost endless. I am an RE Audio dealer, so I absolutely know that they will do you well. Hope this helps.

Aug 25, 2011 | AlumaPro BP-10 Car Subwoofer

1 Answer

I have 1500 kicker amp and 2 15L7 4oh want to hook up


you can't get full power out of it because those subs can be wired series/parrallel to a 1 ohm load or just series to a 4 ohm load and you don't want to put a 1 ohm load on this amp... you need dual 2 ohm subs for this amp... I have the same setup but with dual 2 ohm subs and it is rediculous... you need to buy different subs that are dual 2 ohm or buy an amp that is stable at 1 ohm... you will only get 750 rms out of a kicker 1500.1 at 4 ohms so u will do more harm than good to your subs.

Dec 09, 2009 | Kicker ZX1500.1 Car Audio Amplifier

2 Answers

How to connect HIFONICS BXI 2607 D watt at 1 ohm....


That's dependent on your subwoofers. You will need 2 dual 4 ohm subs wired in Parallel, a single dual 2 ohm subwoofer wired in parallel, a single dual .5 ohm wired in series. Or something similar.

http://www.bcae1.com/spkrmlti.htm

Nov 20, 2009 | Hifonics BXi 2006D Mono Block Amplifier...

1 Answer

Dual 2 ohm or dual 4 ohm?


I would suggest you go with the 4ohm. It won't be a loud but it will be more stable. You will be less likely to blow up your amp with the 4ohm.

Feb 23, 2009 | Kicker Solo-Baric L7 S15L72 Car Subwoofer

1 Answer

Connecting a subwoofer to a mono amp that has 2 sets of terminals


ok this gets confusing sometimes. Ok first look to see what ohm your subs are. If you have a dual 4 ohm sub When you run that on sub + to + and - to - then that will make that sub 2 ohm. its different on ohm if the sub is say a 8 ohm then putting the wires that way will bring that sub to 4 ohm. Now lets say you have 2 subs that are dual 4 ohm and wire both of them + to + and - to - and go bridge the amp which would be both wires from sub both + together and both - wired bridge on the amp will make it a 1 ohm to the amp. Please post what ohm your subs are and i can tell you alittle more about it

Oct 21, 2008 | Verge VGA300M 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

1 Answer

Prsx720


The specs I read on the Pioneer site say the amp is not 1 ohm stable, so keep that in mind.

It partially depends on the impedance of each voice coil on the DVC subs. If they are dual 4 ohm, and you connect the DVCs in parallel ("+"s together, "-"s together), you could run a sub on each channel of the amp(s). This would put about 200W on each sub.

The other option is to still tie the dual 4 ohm voice coils in parallel, tie 2 subs in series (one "+" to the other "-"), and bridge the two channels of the amp (aka put them in parallel). But this, also, would be about 200W on each sub.

Things get different if the subs have dual 2 ohm, 3 ohm, or 8 ohm voice coils.

Mar 15, 2008 | Pioneer PRS-X720 Car Audio Amplifier

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