Hi,
it may be a dual voice coil (DVC) speaker.
Measure the DC resistance of both voice coils (VC).
If they both come out at 1r5 then each VC is 2ohm.
If they both come out at 3r0 then each VC is 4ohm.
They are unlikely to come to 6r0 since 8ohm dual VC are, I think, quite rare.
I advise you keep the VC separate and driven by their own power amps.
If you did want to change the drive method, then I would advise running the VCs in series. This will require a much higher power amplifier to obtain the same SPL from the speaker.
I do not recommend paralleling the VCs.
it may be a dual voice coil (DVC) speaker.
Measure the DC resistance of both voice coils (VC).
If they both come out at 1r5 then each VC is 2ohm.
If they both come out at 3r0 then each VC is 4ohm.
They are unlikely to come to 6r0 since 8ohm dual VC are, I think, quite rare.
I advise you keep the VC separate and driven by their own power amps.
If you did want to change the drive method, then I would advise running the VCs in series. This will require a much higher power amplifier to obtain the same SPL from the speaker.
I do not recommend paralleling the VCs.
As far as my researches can find, all solid state amplifiers perform better into higher impedance loads.
All 2ohm rated amplifiers can drive a 2r0 load and a 4r0 load and an 8r0 load.
Not all 2ohm rated amplifiers can drive a 2ohm reactive load and some make a poor job of driving a 4ohm reactive load.
As I said earlier dual 8ohm drivers are rare.
Most seem to be dual 4ohm and dual 2ohm.
These two options cover speaker loads of 1ohm to 8ohm and meets the desires of most audio reproducers.
Paralleling a dual 4ohm results in a 2ohm load. Very few amplifiers have been designed to drive this load as well as it is capable of driving a 4ohm load. In other words "don't parallel a dual 4ohm VC speaker".
A pair of 2ohm amplifiers could separately drive the two 4ohm VCs and probably do that quite well.
As for paralleling dual 2ohm for a resulting 1ohm load. Leave that to the CAR Audio fanatics that restrict themselves to 13.8Vdc single supply.
All 2ohm rated amplifiers can drive a 2r0 load and a 4r0 load and an 8r0 load.
Not all 2ohm rated amplifiers can drive a 2ohm reactive load and some make a poor job of driving a 4ohm reactive load.
As I said earlier dual 8ohm drivers are rare.
Most seem to be dual 4ohm and dual 2ohm.
These two options cover speaker loads of 1ohm to 8ohm and meets the desires of most audio reproducers.
Paralleling a dual 4ohm results in a 2ohm load. Very few amplifiers have been designed to drive this load as well as it is capable of driving a 4ohm load. In other words "don't parallel a dual 4ohm VC speaker".
A pair of 2ohm amplifiers could separately drive the two 4ohm VCs and probably do that quite well.
As for paralleling dual 2ohm for a resulting 1ohm load. Leave that to the CAR Audio fanatics that restrict themselves to 13.8Vdc single supply.
that is wrong.
The operator has the choice of separate driving or paralleling or series coupling.
That's three options to your mandatory, but erroneous, "has to".
Moving the mixing of the L/R channels all the way down to the driver construction is pretty fun. Kind of like a bi-amped subwoofer, hehe. I've never tried that, so I'll see how it sounds.
The PSU on this board is kind of wimpy, so I might just swap it with the spare LM3886 boards I've got around here.
The PSU on this board is kind of wimpy, so I might just swap it with the spare LM3886 boards I've got around here.
Yeah, I suppose you could put all 4 voice coils in series for 32ohms, but that seems a waste of the available current.
Badman - it'd be interesting trying a DVC sub as one of these servo-subs, with monitoring and stuff...
I know I'm talking about 1 woofer 
.
For the curious - The thing is Altec Lansing. 2 class-D 25W TDA chips drive the two woofer coils separately. 2 class-AB TDA stereo chips drive 4 other channels for satellites. The way I see it - those are all gonna go away, while I keep the box, driver and transformer.
Oh and the auto-ranging multimeter claims 6r0 for each coil, so that would mean dual 8-ohm?
. For the curious - The thing is Altec Lansing. 2 class-D 25W TDA chips drive the two woofer coils separately. 2 class-AB TDA stereo chips drive 4 other channels for satellites. The way I see it - those are all gonna go away, while I keep the box, driver and transformer.
Oh and the auto-ranging multimeter claims 6r0 for each coil, so that would mean dual 8-ohm?
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I know I'm talking about 1 woofer
For the curious - The thing is Altec Lansing. 2 class-D 25W TDA chips drive the two woofer coils separately. 2 class-AB TDA stereo chips drive 4 other channels for satellites. The way I see it - those are all gonna go away, while I keep the box, driver and transformer.
Oh and the auto-ranging multimeter claims 6r0 for each coil, so that would mean dual 8-ohm?
Looks like it is 8 ohm per coil.
Got any pics?
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