Driver efficiency vs. overall speaker efficiency

"Efficiency"???...The only thing I see quoted in specs is SPL in units of dB at 1 meter for 2.83 volts. This is 1 watt for an 8 ohm load.

Power = Volts squared divided by ohms.

(2.83 * 2.83) / 8

For 4 ohms it's 2 watts.

""Efficiency"???...The only thing I see quoted in specs is SPL in units of dB at 1 meter for 2.83 volts. This is 1 watt for an 8 ohm load.

Power = Volts squared divided by ohms.

(2.83 * 2.83) / 8

For 4 ohms it's 2 watts."

What's your point? I already did that math.

My point is that there's a difference between the 2 terms, and those of us who aren't aware and careful, including several members who posted above, tend to mix them.
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Jeffreybehr....My points are:

1. The term "Efficiency" is just confusing. I don't see it quoted by manufacturers.

2. You gave the answer, but did not "do the math" so that others could understand where you are coming from. I am not disagreeing with you. Just making a clarification.

Okay, so "efficiency" deals ONLY with how much volume a speaker can put out? And has nothing to do with the quality of sound reproduced?

I'm learning here... ;-)

When it comes to speakers, "efficiency" is the % of electrical energy that the transducer converts into sound pressure -- the rest being converted into heat, etc...i.e., lost to our ears.

Sometimes this word is used by manufacturers to underline how loud their speakers/drivers can go when fed with a reasonable amount of W (i.e. energy). It sounds "marketing" to me...

Plus you have other manufacturers sporting interesting performance levels, to quote Trelja

who use drivers of 88 db/2.83 V sensitivity and then claim the speakers are 94 db/2.83 V sensitive

...
Would that be 94db @1M, both speakers fed a 1kHz sine wave, the mic on axis, 2ms gate / or is it that they have two drivers in parallel for each pass band / or?