Dual 1 or dual2 ohm subs, whats the difference?

[rookanga 10+ year member]

Im going to be getting a new sub, this sub will be only ran by one amp (for now, maybe in the future ill add another amp) I have a sundown saz2000. When I went to order it, it gave me an option for a dual 1 ohm or dual 2 ohm sub. Whats the difference between each other, is dual 1 ohm subs can only produce 1 ohm and dual 2 ohm subs (if there were two) can produce .5 ohms, or am I thinking of this all wrong?

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[xShoWTeKx 10+ year member]

single d1 can be .5 or 2 ohm

single d2 can be 1 or 4 ohm that simple

 

[rookanga 10+ year member]

is that when theres two of them? im just wonderinbg if the single dual 1 ohm sub, will just produce one ohm or do I have to get a dual 2 ohm to produce one ohm

 

[dragnix 5,000+ posts]

is that when theres two of them? im just wonderinbg if the single dual 1 ohm sub, will just produce one ohm or do I have to get a dual 2 ohm to produce one ohm

a single dual 1ohm sub will produce either 2ohm or 0.5ohm. A dual 2ohm will produce a 1ohm load

 

[The_Grimy_One 10+ year member]

Rockford Fosgate

 

[rookanga 10+ year member]

so its just better to get a dual 2 ohm sub, wire it to one ohm and thatll work perfectly for the one ohm load I want to put on my sundown 2000, correct?

 

[brynm 10+ year member]

Main question is what sub are you looking at? If it can take 2000+ watts RMS then get a dual 2 ohm sub.

Quick lesson:

Parallel voice coils- Final load = (Voice coil ohms) / (Number of coils)

If you hook two voice coils in parallel you will halve the load.... two 2 ohm coils in parallel = 1 ohm, two 4 ohm coils parallel = 2 ohms, etc.

Series voice coils- Final load = (voice coil ohms) * (number of coils)

If you hook two voice coils in series you will double the load.... two 1 ohm coils = 2 ohms, two 4 ohm coils in series = 8 ohms, etc.

 

[plugger 10+ year member]

my sub is dual 1 ohm. right now i have it at 2 ohms. i wanna upgrade my amp for more power. can I wire it to .5 ohms and hope that after box rise it is around 1 ohm?

 

[rookanga 10+ year member]

Im looking at a fi sp4, which is 2500 rms, so its more then the 2000 rms.

The only thing that confuses me, is wouldn’t you think a one ohm sub will produce one ohm and a two ohm sub would just produce two ohms, until you hook up a second sub then it should be divided into half for the ohms, but I guess the way I was thinking was backwards to what really is happening, good thing I asked before buying it

Main question is what sub are you looking at? If it can take 2000+ watts RMS then get a dual 2 ohm sub.

Quick lesson:

Parallel voice coils- Final load = (Voice coil ohms) / (Number of coils)

If you hook two voice coils in parallel you will halve the load.... two 2 ohm coils in parallel = 1 ohm, two 4 ohm coils parallel = 2 ohms, etc.

Series voice coils- Final load = (voice coil ohms) * (number of coils)

If you hook two voice coils in series you will double the load.... two 1 ohm coils = 2 ohms, two 4 ohm coils in series = 8 ohms, etc.

 

[skylineTT 10+ year member]

In the reference section

http://www.caraudio.com/forums/car-audio-reference-database/534041-having-trouble-calculating-final-ohm-load-impedance-your-setup.html

 

[brynm 10+ year member]

Somewhat, but what you are buying is a dual 2 ohm sub. When they say that it means it has two 2 ohm voice coils in the one speaker. That way you can hook that one sub up as either a 1 ohm or a 4 ohm load.

 

[sobe3yourself. 10+ year member]

if your sub is single voice coil (single 4 ohm) you can only have it at 4 ohms

if your sub is dual voice coil (dual 4 ohm) you can have it at either half or double what ohms it says. so a dual 4 ohm sub can be wired at 2 ohms or 8 ohms.

for your setup, i would say get the dual 2 so you can run your amp at 1 ohm to get the full power...if your sub can handle it

 

[dragnix 5,000+ posts]

my sub is dual 1 ohm. right now i have it at 2 ohms. i wanna upgrade my amp for more power. can I wire it to .5 ohms and hope that after box rise it is around 1 ohm?

you can hope for it and it might happen, but why not just be safe?

 

[dragnix 5,000+ posts]

Im looking at a fi sp4, which is 2500 rms, so its more then the 2000 rms.
The only thing that confuses me, is wouldn’t you think a one ohm sub will produce one ohm and a two ohm sub would just produce two ohms, until you hook up a second sub then it should be divided into half for the ohms, but I guess the way I was thinking was backwards to what really is happening, good thing I asked before buying it

I don't mean to sound like an ahole (which i will anyway), but I think you're better off with a lower sub in the lineup just because the SP4 is not for someone at your level of expertise