Quad voice

[evilbeef]

I just bought a 15" audiobahn immortal sub off a friend because he blew his windows out of his car with 2 of them and they are quad voice coils. If i have one sub with 4 voice coils, and my amp is 2 channels what is the best way to wire it all up

[Haibane]

Well what is the ohm load of each coil. probably 2 coils per channel...

[Mannyb18b]

i believe the immortal quads are 2 ohm.

[Haibane]

In that case wire each pair of coils in series, and each pair then into a channel

[bumpinstang77]

What's the amp? You may only want to run 2 of the coils to get the most power from the amp if tis not too much.

[Haibane]

If you don't run all 4 coils you can misalign the sub. Run all 4 coils...

[sr20de4evr]

you can't misalign the sub by only running a few of the coils, but you can easily thermal it

If you only run 2 of the 4 coils, the efficiency of the sub drops by 3dB and the thermal power handling is cut in half.

[CBFryman]

you can misalign the sub by not running all coils in a multiple coil woofer. otherwise most warranties wouldnt void from not running all the coils when burnt voice coils are usually already on the warranty void list. on top of that ive seen it done myself.

[bumpinstang77]

Haibane cbfryman please go hit up adire audio's tutorials. You can run any nuber of coils you want. If you only run two then you can only run half power we need the amp's model to figure it out.......sr20 a loss in 3db is only if they're in parallel correct? My understanding is parallel is the most efficient way while single coil and parallel is less efficient. http://www.adireaudio.com/Files/Tech...oilDrivers.pdf
I've ran my sexxx's with one coil on each sub and they were just fine......I've also acidentally wired an audiobahn out of phase and just like the article says....one was pounding away and this one was motionless.

[sr20de4evr]

You get the 3dB loss because you're using half the windings in the voice coil, which means you have half of the working inductance. The BL is the power of the speaker's motor, B is the strength of the permanent magnetic field, L is the strength of the electromagnetic field (aka inductance), if you cut L by 2 then you cut the BL by 2, and your motor is half as strong. Cutting the motor strength in half drops your efficiency by 3dB, just like cutting the power in half.

And you can't misalign the voice coil by doing this. I guess you guys are thinking that the voice coil is divided into 2 parts, a L side and a R side, with one voice coil on each side. Then if you only run one coil, you're only putting a force on half of the coil and it moves the cone out in a non-linear fashion. But that's not the case, the coils are wound on top of one another. using 1 coil, 2 coils, 3 coils, etc will always push the cone uniformly, you just don't have as much power as if you used all of them.

[CBFryman]

Coils are not always aligned on top of one another. there are bi pole designs and dual airgap designs (such as keenwoods 13" sub).

[sr20de4evr]

and neither of those designs will misalign the coil if they aren't all powered at the same time.....

[GSteg]

sr20 is right. u are not going to misalign the coil by running one, two, etc coils. if so, then why does my idmax and a lot of people's idmax gets misaligned even when running both coils? (it's rhetorical question, take it as a joke).

u got to remember that the upward motion and the downward motion of the cone will not always have the same amount of motor force. this is due to the fringe field when the top plate and the bottom plate has different flux density. As SR20 pointed out, when having 1 less coil of the two, the BL is cut in half. One coil wants to stay at rest and the other coil wants to move. What u get is a weaker push. That's it. Doesn't misalign anything. just pretend that the motor is weak to start with and that there was never a second coil.

[bumpinstang77]

gsteg where the hell ya been..... thought u were gettin outa car audio....welcome back

[GSteg]

yea then until i got the car so i need a system and here i am