WinISD Apparent amplifier load power (VA)

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Just checked WinISD Pro beta 0.50a7 does not appear to correct for multi driver impedance correctly. Chose a peerless XLS10 woofer and tried several configurations, 2, 3, 4, and 5 driver combinations, result is the same impedance for all, meaning the VA load is calculated incorrectly.

It is an old "beta" program.
 
It's L26RO4Y I'm looking at - 2 drivers. Unfortunately it's not in the database and I can't seem to upload the WinISD driver file I created.

Do you think in general the apparent load shows as too much or too little?

Also, can I take this opportunity to ask: when measuring the output of a dual driver sealed subwoofer - do you position the microphone at the point on the baffle that is between both drivers?

Thank you for your help.
 
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