BL - DVC, Series vs Parallel

[vapor602]

If BL is supposed to represent motor force, why does it change so much between series and parallel wiring. Series always seems to show a much higher BL vs parallel.

Does it actually make any difference in a speakers performance? The spec suggests you would benefit from running DVC woofers in series. If you don't then why is the BL affected, and does the spec actually have any purpose when comparing motors in different speakers?

[guitar maestro]

Nope, it is not supposed to represent motor force. It is a motor force factor whose units can be described in newtons/ampere.

The actual force is identical in series as it is in parallel wiring because it is the power coupling coefficient (BL)²/Re remains identical. As you can see in that expression, "Re" plays part in the calculation of force and in parallel wiring, a constant voltage device such as a typical modern amplifier will put out more current into a lower impedance (parallel wiring) than a higher impedance (series wiring). So numerically, BL is lower in parallel, but since Re decreases as well, mathematics tells us that the smaller number in the denominator increases the final numerical value of the entire expression in such a way that it remains constant between both scenarios.