Keep the $10. Better yet, buy an extra toy for a tot.

I'd be happy thinking that you just MIGHT think for an extra millisecond before posting things like this:

I feel bad for ppl who got this explanation - its totally wrong.

"resistance goes down, current goes up."

Lower ohms means less resistance yes, but NOT more power

As for the inefficiencies that lead to someting less than 6 db...I am sure there are formulae, as well, but have never seen anything concise. I'm sure its a combination of everything from resistance of wire going up as current increases, to coil flux, to cancellation due to something rattling at 143 that didn't at 141, to ??. Since even the best conventional loudspeakers only use about 1-2% of the power given them to make sound, there are probably lots of things to consider. When I get more time, I'd like to try the same test at different frequencies. As the frequencies get higher, the power to reach xmax goes up, and that might make for a bigger spread.

You have officially vacated ignorant, without reaching stupid...for this topic, at least

Toby