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Old 17th February 2010, 11:55 PM   #1
odonnks is offline odonnks  United States
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Default Replacing dual coil drivers

Hi All,

I'm replacing the dual coil drivers in a push pull powered sub.

Each is tagged 8 ohm and the dual coils of each is wired in series with a jumper from one voice coil + to the second voice coil - .

I'm not familiar with dual coil driver arrangements.
Two 8 ohm coils are in series on one channel and the other driver wired the same (two coils in series) on the second channel,

My question is:
Do I need to stick with dual coil units or is there a single coil unit I can use?


Thanks !
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Old 18th February 2010, 01:21 AM   #2
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Quote:
Originally Posted by odonnks View Post
Hi All,

I'm replacing the dual coil drivers in a push pull powered sub.

Each is tagged 8 ohm and the dual coils of each is wired in series with a jumper from one voice coil + to the second voice coil - .

I'm not familiar with dual coil driver arrangements.
Two 8 ohm coils are in series on one channel and the other driver wired the same (two coils in series) on the second channel,

My question is:
Do I need to stick with dual coil units or is there a single coil unit I can use?


Thanks !
Bether is both coils in parallel: ++ & --.

Regards zeoN_Rider
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Old 18th February 2010, 09:00 AM   #3
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If they are really 8 ohm units, then two coils in series is 16 ohms. This is unusual, and single coil 16 ohm drivers suitable for subwoofer use are extremely rare.

Are you sure the coils are 8 ohms each? They are much more likely to be 4 ohms per coil, giving an 8 ohm total load to each channel of the amplifier.
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Old 18th February 2010, 09:58 AM   #4
odonnks is offline odonnks  United States
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I thought 8 was odd too but the tag on the speakers says 8 ohm along with the Mfg's name.
They are in series for sure.

I have have after-market replacements on the way, we'll see how they work...

Thanks!
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Old 18th February 2010, 04:39 PM   #5
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Quote:
Originally Posted by zeonrider View Post
Bether is both coils in parallel: ++ & --.

Regards zeoN_Rider
Depends. Two 4 ohm coils in parallel will cook many amps, so there is no general rule.

It sounds like you'll be using two of these DVC drivers.

If so, series-parallel the coils to give 8ohm impedance, then you can hook it up safely to one amplifier.
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Old 18th February 2010, 05:03 PM   #6
odonnks is offline odonnks  United States
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Originally Posted by chris661 View Post
Depends. Two 4 ohm coils in parallel will cook many amps, so there is no general rule.

It sounds like you'll be using two of these DVC drivers.

If so, series-parallel the coils to give 8ohm impedance, then you can hook it up safely to one amplifier.

Series - parallel is how the two drivers were originally connected.

Isn't a push pull arrangement two parallel drivers with one 180 deg out of phase?

Without a schematic its tougher to follow the circutry but if both drivers with series VC's were connected in parallel to the same amp the result impeadance would be 8 ohm?
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Old 18th February 2010, 05:16 PM   #7
Glowbug is offline Glowbug  United States
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Old 18th February 2010, 05:17 PM   #8
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If one driver is out of phase (you are correct, they will be), then wire the two coils for each driver in series.

When you put those groups in parallel, connect them so there's a + and a - at each end.

____+voicecoil1-_____+voicecoil2-_____
|
|____-voicecoil3+_____-voicecoil4+____|

Voicecoils 1&2 will be 180 degrees out of phase with voicecoils 3 and 4

Edit - the diagram didn't show as hoped...
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