4 x Kicker comps 12" wiring

[juzzyx]

Hi,

I have currently have 2 x Kicker Comps (10DC122) 150rms, each sub has 4ohm impedance.

I want to add in another 2 comp subs. My amp is rated for 600rms at 2ohm.

If I wired my current 2 subs to 8ohm in series then added an additional 8ohm sub and 4ohm sub all in parallel would this give me 2ohms back at the amp?

(4+4)Ω::::8Ω::::4Ω::::::2Ω amp?

Is it stable to run subs with different impedance?

[StoneX]

No, you cannot use different impedance subs together has the lower impedance subs draw more power. You also should not run speakers in series.

You cannot get a 2 ohm load to that amp with four 4 ohm subs, you need four 2 ohm subs or four 8 ohm subs.

[juzzyx]

Oh ok, So this wouldn't work?

[wraith]

Did you even read what he said. It will not work!

[AmmoJammo]

hell no!

maybe if all the subs were in separate enclosures... in different cars lol

[one_and_only2004]

A mate of mine used to run his dual 2 ohm type X sub coils in series so he'd have a 4 ohm load - nothing blew up or caught on fire even after 2 years.

[StoneX]

A mate of mine used to run his dual 2 ohm type X sub coils in series so he'd have a 4 ohm load - nothing blew up or caught on fire even after 2 years.

I said speakers, not coils. Running speakers in series can cause back-EMF (google it), running voice coils in series does not.

[StoneX]

Oh ok, So this wouldn't work?

2 ohm final load is correct... But the top 2 subs would get 75W each, the middle one would get 150W and the bottom one would get 300W... Doesn't really work, does it?

[AmmoJammo]

2 ohm final load is correct... But the top 2 subs would get 75W each, the middle one would get 150W and the bottom one would get 300W... Doesn't really work, does it?

perfect! whats the problem? :P

[one_and_only2004]

I said speakers, not coils. Running speakers in series can cause back-EMF (google it), running voice coils in series does not.

Yeah, it does. A voice coil is the same as a speaker.

[AmmoJammo]

Yeah, it does. A voice coil is the same as a speaker.

yeah, no its not.... lol

[StoneX]

Yeah, it does. A voice coil is the same as a speaker.

You should have Googled it, like I recommended. I tried to help but now you've made yourself look stupid. Here's the info you should have found.

How do you run speakers in series?
It is not suggested that you run speakers in series. No two speakers will be exactly identical, even if they are the same model from the same manufacturer. This means that they will act slightly different from each other when presented with the same input signal. When wired in series, these differences will cause distortion in the form of back EMF.
You can however run both coils of a DVC speaker in series. The cone movement for both coils will be identical, and will not cause distortion problems.

It is far less desirable to make subwoofer to subwoofer connections in series. Because of slight and unavoidable differences between speakers and because of the high likelihood of uneven loading between different speakers in a car, there will be slight differences in the mechanical behavior of the two speakers in series. These differences in movement result in induced voltage (called back EMF) being created by the speakers across the series connection. This effect causes a problem when two speakers which behave differently are connected in series because the speakers can modulate each other (cause each other to move), resulting in distortion. The problem becomes more serious as more speakers are connected in series.

A good experiment to show the effect of back EMF is the following: connect four speakers in series and short the positive and negative input leads of the series circuit. Push down on one cone with your hand; you will notice that the three other speakers will move in the opposite direction of the one you are pushing. Now, reconnect the speakers in parallel, short the inputs and push down on one cone. The speakers will not modulate each other because each one is shorted directly.

Back EMF modulation is not a concern when the voice coils of a dual voice coil speaker are wired in series to each other because the coils are physically coupled on one moving mass. Therefore, they cannot possibly modulate each other because they cannot move independently.

[one_and_only2004]

You should have Googled it, like I recommended. I tried to help but now you've made yourself look stupid. Here's the info you should have found.

Well there you go, you were right and you got a chance to belittle me. If you look into it all coils create back EMF, it's built into the very nature of a coil moving in a magnetic field -that's what I was basing my idea on.

[acarmody]

So I have a question. I have two identical amps that have a bridging function that allows the two amps to create a single 4-ohm load. I also have two identical sub in identical boxes, they are DVC 4-ohm 12" L7s. I have them wired in parallel in the boxes to create 2-ohms, and then in the two boxes in series to create the single 4-ohm load, is this bad?

I currently only have 1 amp and 1 sub in the car so I can have some boot space, but if I want to show off or go to a comp I will put all the gear back in.

[StoneX]

Well there you go, you were right and you got a chance to belittle me. If you look into it all coils create back EMF, it's built into the very nature of a coil moving in a magnetic field -that's what I was basing my idea on.

Next time take the advice to Google it before arguing back then

So I have a question. I have two identical amps that have a bridging function that allows the two amps to create a single 4-ohm load. I also have two identical sub in identical boxes, they are DVC 4-ohm 12" L7s. I have them wired in parallel in the boxes to create 2-ohms, and then in the two boxes in series to create the single 4-ohm load, is this bad?

I currently only have 1 amp and 1 sub in the car so I can have some boot space, but if I want to show off or go to a comp I will put all the gear back in.

It's simple, don't wire speakers in series. Wire the coils in series so each speaker is 8 ohm overall and then wire the speakers in parallel to create your final 4 ohm load.

[acarmody]

It's simple, don't wire speakers in series. Wire the coils in series so each speaker is 8 ohm overall and then wire the speakers in parallel to create your final 4 ohm load.

Thats what I thought after the above posts. Cheers, mate.