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Old 03-01-2017, 05:40 PM
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Factory sub wiring question

I am adding a factory sub box and aftermarket mono amplifier to my X5. I would like to run the 8ohm subs in parallel to bring them down to 4ohm (I believe)

The factory subs have two sets of wires coming from each. Can someone tell me why?
I am guessing that I need to connect all the green wires and all the green and black striped wires so I end up with just two wire leads?

Any advises is appreciated, thanks!

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Old 03-01-2017, 05:59 PM
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I believe but don't quote me is because they are dual voice coil? I'm not a wiring expert -

I would like to replace the factory subs with 2 better ones of nicer material but haven't found anything yet that would work and I don't want to cut up wiring or get a new amp etc
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Old 03-01-2017, 06:48 PM
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Thanks RB,

I just read up about dual voice coils and it looks like if I connect all the green and all the green and black, it might make it 2ohm. Still not totally sure.

I have done this with a e39 factory sub box however I don't recall the subs having two sets of wires each. It sounded really nice in the five series so I thought I would give it a shot in the X5.
Just installed an Eonon 5166x and am already the new features.
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Old 03-02-2017, 10:53 AM
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Its really about how they are connected to the car from the factory that lets you know what type of impedance the amp is seeing normally -

Like for example this would keep the factory impedance of 8ohm (substitute 6ohm for 8ohm)

2 DVC drivers with Voice Coils in Series / Parallel


Connecting the two voice coils of each driver in series (+ to -) and the drivers themselves in parallel (+ to +, etc.) will result in the following impedances:
Dual-6 Ohm Subwoofers: 6 Ohms
Dual-4 Ohm Subwoofer: 4 Ohms
Dual-2 Ohm Subwoofer: 2 Ohms
Dual-1.5 Ohm Subwoofer: 1.5 Ohms
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Proud 3-Pedal owner, UUC SS/AFE/4.8iS Exhaust/Sharked
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Old 03-21-2017, 02:09 PM
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RB, check these links out.
Subwoofer Wiring Diagrams
Subwoofer Enclosure Calculators, Parallel, Series, Port Length and Volume

http://knowledge.sonicelectronix.com...woofer-wiring/
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Last edited by Clockwork; 03-21-2017 at 02:15 PM.
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Old 08-25-2017, 09:01 PM
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Just for experimentation get a decent multimeter, connect the wires on the sub terminals and see what the resistance is at the amp end. Make sure the wires are not connected from the amp or else you'll measure resistance from the amp as well as the subs.

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