ADDING shaker door subs, can i wire into 5x7? - Mustang Evolution

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Old 07-05-2015, 10:23 AM   #1
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ADDING shaker door subs, can i wire into 5x7?

hey guys!
Not sure if anyone has run into this before.
I have a 2012 GT Base, but I am upgrading the door panels to premium.
That means I am adding STOCK 8" door woofers (the weird 1.2 ohm dvc ones)
But i don't have the stock amp that usually powers these in the premiums.

So, my question is, can i just run wires off of the 5x7s in the upper door (wired in parallel) to the 8" subs?

My concern is that since the subs are 1.2 ohm, wiring in parallel to the 5x7 door speaker (i assume is 4 ohm) it would lower the resistance that the head unit amp sees as a load, and would run it a little hotter.

I realize adding an amp to power these subs would be ideal, but i'm not there yet.
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Old 07-05-2015, 12:48 PM   #2
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You need to hook them up with an amp.


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Old 07-05-2015, 02:57 PM   #3
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I went ahead and installed the door panel. wired the DVC sub in series, to bring it up to 2.4 ohm, then tapped into the wires on the 5x7 in parallel. Should be about a 1.6 ohm load (2.4 + 4 = 6.4 /4 = 1.6)
So i'll be pulling about twice as much wattage from the headunit. I hope it is stable!
works, didn't blow up yet.
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Old 07-10-2015, 02:07 PM   #4
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Time will tell when you crank it

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Old 07-10-2015, 02:12 PM   #5
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Quote:
Originally Posted by jbecknell View Post
I went ahead and installed the door panel. wired the DVC sub in series, to bring it up to 2.4 ohm, then tapped into the wires on the 5x7 in parallel. Should be about a 1.6 ohm load (2.4 + 4 = 6.4 /4 = 1.6)
So i'll be pulling about twice as much wattage from the headunit. I hope it is stable!
works, didn't blow up yet.

No way this will last. You will overheat your head unit for sure.

Plus, doesn't it sound like garbage?


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Old 07-10-2015, 03:31 PM   #6
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Yes, it kind of does sound like garbage.
don't want to burn out my HU.
Plus i just got infinity 5*7 to replace the stock.
they call them "True 4ohm" but listed at 2ohm. some BS saying the guage of wire and heat when running would cause the HU to see them as 4ohm.
If they ARE 4ohm, then paired with the 1.2Ohm DVC in series-parallel, then it would be 1.6 ohm load.
If it is a 2 ohm speaker, then adding the 8" will drop it to a 1.1 ohm load.
on an amp probably paired to 4 ohm.

SO... I assume this means, i must bite the bullet and get an amp for the 8"?
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Old 07-10-2015, 03:47 PM   #7
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I would. Otherwise I wouldn't run them.


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Old 07-11-2015, 11:20 AM   #8
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Alright, you all scared me straight. I hate having speakers that aren't running, but I'd REALLY hate to blow the HU.
I unhooked the door woofers for now. Sucks having a speaker there not doing anything though.

The after-market 5x7 sound much better, so there's that.

When I add an amp for a real sub in the back, I'll just pony up for a four channel, and run the sub(s) off of 2 channels, and the front subs off of 2 channels. and I'll use the front speaker output converted to RCA.
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