To: The AMC Brains Trust

Aight guys... got 3 DVC subs... each coil at 4 Ohm's...

Is there a way to get that down to 2 Ohm's total?
Or even 4 Ohm's?
Cheers :)

having two in series and one parellel to both would give you total of 4 ohm (i think :confused:

just buy three amps and run one on each at 4 ohm :cool:

having two in series and one parellel to both would give you total of 4 ohm (i think :confused:

just buy three amps and run one on each at 4 ohm :cool:

How are you gonna have 2 subs in series set up in parrallel with a single sub? Edit: I see what u mean.

here is an illistration of what i meant, not sure if im right but here goes

i think the only way to wire 3 DVC subs is to put them all in parrallel with the coils in series. This will give u a 2.6 ohm load. Dunno how many amps can do that though. I know a vibe monobox 4 can

i think the only way to wire 3 DVC subs is to put them all in parrallel with the coils in series. This will give u a 2.6 ohm load. Dunno how many amps can do that though. I know a vibe monobox 4 can

Can it then be loaded with resistors to exactly 2 Ohm's?

Can it then be loaded with resistors to exactly 2 Ohm's?

Theres no point, reducing the load the amps seeing with plane resistors, this would mean the amp would be less effecient and if anything the sound would be worse, the only difference would be that your amp would run hotter using more power.

Matt86 is on the money, just be sure your amp is capable of handling this kind of setup.

Theres no point, reducing the load the amps seeing with plane resistors, this would mean the amp would be less effecient and if anything the sound would be worse, the only difference would be that your amp would run hotter using more power.

Matt86 is on the money, just be sure your amp is capable of handling this kind of setup.
The only problem being that the response monoblock's are stable at 1,2, and 4 Ohm's... not 2.6... :confused:

dump one of the subs then and run it at 1 ohm or 4 ohms. I dont think there would be much difference between running 2 subs and 3 subs.

Alternatively buy another of the same subs so you have 4 in total. Then you can give your amp a 2 ohm load. Prob not enough power for that though

dump one of the subs then and run it at 1 ohm or 4 ohms. I dont think there would be much difference between running 2 subs and 3 subs

3 is good... 2 is bad...

Any ideas how to run 3 at 2 Ohm's? :)

you cant.....

its against physics.... lol

you cant.....

its against physics.... lol
How so?
If it is atleast give me a reason :P

How so?
If it is atleast give me a reason :P

let me find my essay, lol.

To get them close to 2ohms impedance you need to set each sub up so that its 2 coils are in series and then parallel the 3 subs together... 2 x 4 ohm coils in series = 8 ohms, 3 x 8 ohms in parallel = 2.67 ohms. Eeach sub has to be configured the same otherwise each will dissipate different amounts of power, ie. Some getting driven harder than others. The other options are parallel coils, parallel subs = 0.67 ohms (undriveable with almost any amp) or parallel coils, subs in series = 6 ohms (drive that off any amp)

As to the suggestion that the amp is stable at 1, 2 & 4 ohms.. that pretty much means that the amp can run with a load impedance no less than 1 ohm, so 2.6 ohms should be alright if the amp u’re looking at has these specs.


Cummins.

Yep Cummins is on the money
http://akamaipix.crutchfield.com/graphics/infolib/carlib/subs/3_4ohmDVC_267ohm.gif
Any impedance above what your amp is stable at is fine. In terms of SPL The benefits of having 50% more surface area will outweigh the slight increase in output that your amp will provide from 2 ohms to 2.67.

Peace

Tim

Cheers guys! :D :thumbsup:

see i told you... against physics :D

hehelol

So the amp is outputting 2.67 ohm, but each sub is only getting 4 ohm each, correct?

So the amp is outputting 2.67 ohm, but each sub is only getting 4 ohm each, correct?

subs dont get ohms. The coils on the subs are resistors that present a load to the amp.

subs dont get ohms. The coils on the subs are resistors that present a load to the amp.
Ah fair enough, so a 2 ohm sub wont run on a 4 ohm stable amp unless you have 2 2 ohm subs in series?

The load impedance the amp would see is ~2.7ohms, say you've got one of those 800WRMS Jaycar D-class monoblocks, they can output about 820WRMS @ 1ohm, 700WRMS @ 2ohms and 400WRMS @ 4ohms. I’m not going into why the output doesn’t just double when you halve the impedance as that’ll just confuse people. So lets say you have approximately 600WRMS power output of that amp at 2.7ohms load, because each sub is configured the same and is the same model etc. they should have identical voice coils and therefore if paralleled together they should each receive a third of the power ie. 200WRMS each.

Cummins.

The load impedance the amp would see is ~2.7ohms, say you've got one of those 800WRMS Jaycar D-class monoblocks, they can output about 820WRMS @ 1ohm, 700WRMS @ 2ohms and 400WRMS @ 4ohms. I’m not going into why the output doesn’t just double when you halve the impedance as that’ll just confuse people. So lets say you have approximately 600WRMS power output of that amp at 2.7ohms load, because each sub is configured the same and is the same model etc. they should have identical voice coils and therefore if paralleled together they should each receive a third of the power ie. 200WRMS each.

Cummins.
i get that, but if the amp cant do anything less than 4 ohm, will it sh!t itself if you do that?

i get that, but if the amp cant do anything less than 4 ohm, will it sh!t itself if you do that?
Never place a load on an amp that is lower impedance than the minimum stable load or you risk killing the amplifier.

Never place a load on an amp that is lower impedance than the minimum stable load or you risk killing the amplifier.
Ok cool thats what i wanted to know :).

Ah fair enough, so a 2 ohm sub wont run on a 4 ohm stable amp unless you have 2 2 ohm subs in series?

that is correct, as the amp sees the 2ohm sub as a short circuit if it isn't designed for 2ohm operation (the amp that is). Either the amp will burn out when driven too hard or the short circuit sensing (if it has any) will kick in and won't allow amp to stop working.
If you use a 2 ohm speaker on a 4ohm amplifier (thats not suitable for 2 ohm operation) you will force the amp to distort (putting a dv voltage into the speaker) hence putting huge stress on the voice coil ending up in not only the amp burning out but also the speakers voice coil.