Simulating multiple drivers in one horn (hornresp)

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Hornresp has confused me a little (again 😉) with regards to simulating multiple drivers in the same horn.

Am I wrong to assume that if a horn with a single driver has a sensitivity of 105db/watt (for example), the same horn with two drivers should see a gain of 3db, to 108db/watt, and with 4 drivers to 111db, etc?

Because if I select multiple drivers and specify them as being connected in 2 series 2 parallel, and enter 1 watt at 8ohms, rather than an increase in 6db as expected, I see only 3db. Is this correct?

Cheers,
Jonathan
 
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