Replacing dual coil drivers

[odonnks]

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 !

[zeonrider]

Originally Posted by odonnks

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

[Don Hills]

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.

[odonnks]

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!

[chris661]

Originally Posted by zeonrider

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.

[odonnks]

Originally Posted by chris661

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?

[Glowbug]

Rockford Fosgate® - Woofer WiringWizard

[chris661]

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...