Kicker Comp VRs, help me solve this VC debate

[nweibley 10+ year member]

I'm being told you CANT wire three DVC 4 ohm kicker woofers into a 1.33 ohm load. Check me on this, but I am 99.999% sure I am right.

If you take two subs, wire their voice coils in series, each sub is effectively 8 ohms (4 + 4 = 8) (That is two woofers at 8 ohms each)

If you take those two subs and wire them in parallel, the total impedance is 4 ohms for the pair (1/8 + 1/8 = 1/4) (That is TWO 8 ohm woofers wired in parallel, 4 ohms total now... ONE 4 ohm pair of DVC woofers)

If you take the last sub, wire its coils in parallel, you get (1/4 + 1/4 = 1/2) so it is at two ohms. That is ONE 2 ohm sub. Two 4 ohm coils... one 2 ohm pair. Then wire the sub at 2 ohms in with the other pair at 4 ohms so you get (1/4 + 1/2 = 1/(3/2)) or 1.3333 ohms.

Correct, yes?

Click to read more...

 

[DJ FURY 10+ year member]

Nope....3 4ohm dvc woofers will put u at 2.67 ohms

 

[DJ FURY 10+ year member]

link for u to check out

http://www.crutchfieldadvisor.com/S-VlOEQVjgzcP/learningcenter/car/subwoofers_wiring.html?subs=3&impedance=DVC4x2

 

[nweibley 10+ year member]

Anyone that understand impedance better than the crutchfield advisor want to check this for me.

Not to be offensive... but this is a little past what crutchfield advisor is going to tell you.

 

[DJ FURY 10+ year member]

Hey just trying to keep things safe and simple for u thats all.

 

[nweibley 10+ year member]

Yeah yeah, I understand. This is not my install anyways, it's just for a friend looking to buy and amp, and I'm trying to get him as close to 1 ohm as possible without going under, to really open up his options.

 

[DJ FURY 10+ year member]

Yeah its cool,its all about helping friends out when it comes to car audio.Good lookin out.

 

[rswroughneck 10+ year member]

i'm not an electrical expert or anything so take this more as a ? then as a statement

I don't know if i would want to run it to where you have 1 2ohm sub and 2 8ohm, becuase i would think that since electricity takes the path of least resistence wouldn't most of you power take the easiest path?? now the math does look right to me i just never heard of anyone running different ohm ratings on there subs before and maybe that is the reason.

anyway maybe someone that knows a little bit more about it can answer this ? for us

 

[avistar23 10+ year member]

RT= (R1xR2)/(R1+R2)

RT= (3x4)/(3+4)

RT= 1.74 ohms.

HMM that dosent sound right to me, might be a problem in my math. Dosent appear to be a problem tho.

-Mike

 

[nweibley 10+ year member]

That was the only thing I was thinking.... mabey a fourth sub would really clear these issues up //content.invisioncic.com/y282845/emoticons/wink.gif.608e3ea05f1a9f98611af0861652f8fb.gif

 

[rswroughneck 10+ year member]

yep four subs might just be a little simpler

 

[helotaxi 5,000+ posts]

You CAN wire it to 1.33 ohms, but you shouldn't.

Reason: The sub with its coils in parallel will be getting twice as much power by itself as the two with their coils in series will be sharing. Basically one of the 3 will get 4 times as much power as each of the other two. This is bad. You want a 1 ohm load from 4 ohm DVC woofers, you need either 2 or 8. Four will give you a 2 or a .5 ohm load.

Basic rule of thumb, never run subs of different impedances on the same channel.