I believe that the references to force in this discussion are unnecessary and are contributing to confusion, and I believe that Atmasphere is correct. A short while ago I posted as follows in the other thread I referenced above, in relation to this matter: - almarg
Look up the formula for sound power. It is defined by a force exerted over an area and assigned a vector (dot product). The formula for electrical power consumed is entirely different and far simpler - based on measured voltage and current. Understanding the distinction between the two is what provides the necessary insight to explain why efficiency is increased when voltage is DIVIDED (series) among loudspeaker drivers and remains unchanged when SPREAD (parallel) across the same driver. This is trivial first year electrical engineering subject matter. I can’t help the fact that you don’t understand it - regardless of your so called "credentials", "qualifications", or number of posts on Audiogon. To pay adequate deference to the people who developed this body of knowledge, you have to pay attention to things like units. Mixing and matching units in these equations results in obvious error. Again, the formula for sound power is readily available on Wikipedia for all to see. It involves applied force and area which dramatically alters the net resulting analysis. Electrical power input is totally separate and distinct and you cannot ASSUME the two are equivalent. There’s a reason the graph shown in the web page for db conversion that Erik linked to has a value of -6db for voltage gain/loss and -3db for sound power. One look at the two formulae for sound power and electrical power will explain why if you care to devote the time to examine them closely. And with that, I’m done attempting to set the record straight. All I get are insults for my trouble. No good deed ever goes unpunished.
