4 subs on a mono amp?

sorry the topic sounds like im cranking xplodes, but here is my question. can i run 4 subs on a mono amp? the problem is that i need two of them inverted.  the subs are svc 2 ohms. the amp is stable to 2 ohms. checking the wiring digraham 2*2 parallel =1   then 1*1 series = 2.   i know that iverted subs need to be wired in reverse "polliarity" (sorry i cant spell) of the regular mounted subs. i already have the amp, and the holes cut out in the back deck. im just intrested in switching out subs from 15s to 12s.  i love the look of the magnets sticking out of the rear deck, but i think that inverted subs in a trunk look stupid plus cause problems. i hopping that im not barking up the wrong tree here.  

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well that was fun

I think reversing polarity will screw up your series/parallel wiring scheme - you can't series something if you're reversing polarity on a pair of the subs.  You won't end up with two ohms - but I can come up with so many ways to wire that in my head I'm not quite shure what you'll end up with.

If you were not reversing polarity - this would be a simplistic wiring matter - series two of the woofers, then parallel the two sets of woofers together, and you would end up with a nominal load of two ohms.

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"I'm finished!" - Daniel Plainview

No, reversing the polarity will have no effect whatsoever on the total load.

To make it easy on yourself, put all the woofers in th enclosure (or pretend...) and wire them for the desired impedance. Now invert the woofers that you want inverted. Once that is done, reverse the leads on the inverted woofers ONLY. Done.

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It all reminds me of something that Molière once said to Guy de Maupassant at a café in Vienna: "That's nice. You should write it down."

heamphyst wrote:

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No, reversing the polarity will have no effect whatsoever on the total load.

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?

Swapping the + and - leads on the woofers will parallel the woofers - that were wired in series - once they are all hooked up.  How will this not parallel the entire circuit?  I'm confused.

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"I'm finished!" - Daniel Plainview

Just because you reverse the polarity (so the positive amplifier signal is connected into the negative terminal of the woofer) it will not change the entire load... It's STILL a 2 ohm (individually addressed) voice coil. Reversing the polarity does nothing but reverse the polarity of the magnetic field - a MECHANICAL change - not an electrical nullification or changing of impedance or resistance...

I am not saying to change the wiring, just the connections... Still leaving the woofers in the circuit JUST THE WAY THEY WERE, (electrically), just swapping the positive terminal with the negative terminal, on JUST the inverted woofers.

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It all reminds me of something that Molière once said to Guy de Maupassant at a café in Vienna: "That's nice. You should write it down."

Here's a diagram.  The two subs on the left are a series-wired set (a normal and an inverted), and the two on the right are also a set.  Each set amounts to 4 ohms.  The two sets are paralleled for a 2 ohm impedance (shown with the curved lines).  The wires shown at the far left and right will go to the amplifier.

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Build the box so that it performs well in the worst case scenario and, in return, it will reward you at all times.

Yea I had to draw it myself before I could figure it out!

I had no idea you could wire that way.  huh.

Thanks, stev.

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"I'm finished!" - Daniel Plainview

Shown below is a different way to achieve the same result.  Here, the series-wired sets are combined as normal / normal and inverted / inverted.  So since we are paralleling a normal set with an inverted set it's the parallel wiring, rather than the series wiring, that differs from the norm.  It is a series / parallel wiring scheme (with curved lines representing the parallel wiring.

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Build the box so that it performs well in the worst case scenario and, in return, it will reward you at all times.

sedate wrote:

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I had no idea you could wire that way.

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And good reason for that, sedate.  You can't.  That is some messed up wiring. 

After I had some time to sober up I looked at it again, tried to figure out impedance, and realized it made no sense.  I erased the wiring and rewired that diagram correctly.  It should look like this:

But still, it's more complicated than it needs to be.  Use the second diagram I posted and disregard this configuration (where a normal is paired with an inverted) altogether.  Just pair the subs normal with normal and inverted with inverted like the second diagram shows.  Sorry for the bad diagram.

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Build the box so that it performs well in the worst case scenario and, in return, it will reward you at all times.

THAT'S the one!

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It all reminds me of something that Molière once said to Guy de Maupassant at a café in Vienna: "That's nice. You should write it down."

I was also wonder what the hell was going on with that wiring Steve lol