How many ohms of resistence are made from 4 12's that are 2 ohms a piece, single voice coil?

 

Wiring the voice coils in parallel will give you 1 ohm, series will give you 4.

 

can most 1 ohm stable amps run 4 12's?

 

Reading your initial question again, my answer was based on subs with dual voicecoil (dual 2ohms). With the dvc, you get 1 ohm (per sub) wiring each voice coil in parallel, and 4 ohms (per sub) in series.

To quickly answer your question, (4) 12' subs that is 2 ohms each (single voice coil) will not work with one amp because it will give the amp less than an ohm of load. Most amps aren't stable in <1ohm of load. The only time you can use all 4 of your subs is if you run a separate amp on each one. Or use only 1 sub which will drive your amp into 2 ohm load.

Look at these links for further info:
http://www.jlaudio.com/tutorials/dvc/index.html
http://www.jlaudio.com/tutorials/wir...dex.html#3svcp

Hope this helps.

 

You can mix series and parallel to get a final 2 Ohm load from 4 2 Ohm subs. That's probably your best bet.

 

Will mixing the loads make it have different levels of sound output comming from each speaker? If i mix the resistances is it alright if i use 1 amp still?

 

Yeah, it's fine... as long as your amp is that powerfull to push all four of them. You can wire them as following:
Sub A & B in parallel = 1 ohm load
Sub C & D in parallel = 1 ohm load
Connect these 2 loads in series, so that you get 2 ohms
That's what people usually do with 2 DVC subs.

 

Just curiosity, what subs and amp are we talking about?

 

Polk Momo subs the mm1202 and either a polk c500.1 amp or a planet audio 1250.1 amp or a boston acoustics gt-28

 

Actually I think your first post was right on with either a 1 or 4 Ohm. As well as MaximaDans with combining series/parallel.

The amp could also work if it was a 2 channel..2 Ohm stereo capable.

--Don

 

Hmmm....never thought of it that way! I never had that many subs to wire together and give the least amount of loads.

Kikcaffine, how are you going to fit (4) 12" in the trunk?

 

2 in the back, and one on each side the back 2 are in, the side two will prove to be difficult though

 

Interesting......all 4 subs are going to be inside the box firing outward, from its own chambers? If so, that's going to be a pretty big box...no?

 

i will effectevly have no trunk!

 

I found this link which should be very useful, it has many tools. Enjoy!

http://www.the12volt.com/caraudio/boxcalcs.asp