Unibox with a DVC subwoofer??

[bobhowell]

I see no place to account for DVC in Unibox. Im working with MCM 8" DVC, which has values for one coil connected. How do I get it to handle both in parallel?

Bob

[ThomasW]

The user needs to enter the data according to whether the VC's are wired in series or parallel

[Dennis H]

Given the specs for a single coil (if you're really sure that's what they are):

For parallel, cut Re, Le and Qes in half. Recalculate Qts = 1/(1/Qes + 1/Qms).

For series, double Re, Le and Bl. Cut Qes in half. Recalculate Qts = 1/(1/Qes + 1/Qms).

I don't know anything about that driver but it's unusual to list the single coil specs.

[bobhowell]

Yes, But how do I do it? As two speakers in parallel? I see no way to enter this.

[ThomasW]

Enter the data for a single speaker, adjusting it for series or parallel wiring.

[bobhowell]

Given the specs for a single coil (if you're really sure that's what they are):

For parallel, cut Re, Le and Qes in half. Recalculate Qts = 1/(1/Qes + 1/Qms).

For series, double Re, Le and Bl. Cut Qes in half. Recalculate Qts = 1/(1/Qes + 1/Qms).

I don't know anything about that driver but it's unusual to list the single coil specs.

I have checked and impedance, Re and Le are per coil. So I will try your formulas. I want parallel.

Thanks

[Dennis H]

Sounds good. The specs are really a gotcha game. Sometimes mfrs will list everything in parallel but list Bl in series because it makes the motor look stronger. If you have WinISD Pro (free download) you can enter specs you're pretty sure of and have it calculate the ones you aren't sure of to check for internal consistency. In fact you have to do it that way because it won't save a driver file with inconsistent specs. The help file tells how to do it.