Question on simulation

[generic]

I just realized I have a problem. I'm wanting to simulate this driver, but the measurement I was tracing was hooked up as 4 ohms. I want to use each voice coil as a stereo signal.

Is there a formula I can use to know what the ohms resistance would be per voice coil? Also, would it be safe to subtract 3db on the gain, or would that not be close enough?

Here is the driver I'm trying to work with.

http://www.parts-express.com/pe/show...number=295-484

[Sydney]

Each V.C has a Re of 6.4 ohms.

[generic]

Thanks for the info.

Would the overall SLP measure differently if each coil was measured on it's own? I'd hope the curve would be the same, but would peak SLP be different, or will a Re of 6.4 account for that?

[Sydney]

If I understand what you are asking and based upon the specs ( which use the defacto standard of parallel coil wiring ) the Total power ( Pmax ) is 80 watts RMS ( ea. coil: 40 watts ).
A theoretical 3db difference in peak SPL - If ONLY 1 coil was power, when both are powered a 3db increase, regardless of how it is powered ( each coil powered separately or paralleled on 1 amp ).
The difference is in how power is being provided: Using 2 amp channels, each "sees" an 8 ohm load ( 6.4 ohm Re ) Voice coil winding and requires half the current per channel.
Each of 2 amps provide a stable 40 watts vs 1 amp with Paralleled VC ( dropping RE to 3.2 ohms ) providing 80 watts with 2x the Current demand.
For simplicity: It can be modeled as a 4 ohm ( 3.2 RE ) single VC with 80 watts Pmax and the same mechanical T/S specs.

[generic]

I'm attempting to simulate a micro 2.1 passive system. Both coils would be used, but as separate stereo channels. So 8ohms each channel.

I figured it would be a 3db drop, but I didn't know if 3db would be a generic overall guess or good enough.