Originally Posted by commsysman
Your statements re "basics" are in error.
A 3 db increase in SPL is perceived as "twice as loud".
Simply not true. 3 dB is a doubling of power, but that isn't the same as perceived loudness. Anybody who works with professional equipment that has proper dB calibrations knows that 3 dB is clearly noticable, but nothing like twice as loud.
You are claiming it takes a 10db increase, which is nonsense.
A 10db increase in SPL is DEFINED as 10 times as loud!
No, 10 dB more is 10 times as much power.
Here, lets do a little research:http://www.gcaudio.com/resources/how...eloudness.html
"Looking at the chart, and starting at the left, we can see than an increase of 3dB results in a voltage increase 1.4 times the original, a doubling of power, and yields only a subjective increase in loudness only 1.23 times the original. To get a doubling of loudness, it is important to note that an increase of 10dB is necessary. And to reproduce that volume through our loudspeakers, note that we require ten times more power from the amplifier!"
If you Google around a bit you can find many recitations of the same basic idea. I'm not going to post any more because its so easy to confirm this.
As noted above, the Klipsch RB-81 has a sensitivity of 97db/watt (and there are several models that are even more sensitive). It is readily available at a reasonable price.
That's a specification, and it may or may not be taken at face value. Speaker sensitivity is one of more often fudged
specs that there are. For example, it is possible to build a speaker that has a 3 dB rise in the frequency range on which the specification is based (which is usually not given with the spec) but is actually half as efficient over much of the audible range. A 3 dB variation in speaker frequency response is often accepted by many listeners.
Building efficient midrange speakers and tweeters is not nearly as tough and inherently expensive as building woofers that have high efficiency, reasonable size and linear bass extension. In fact many permutations of the latter are completely impossible according to the laws of physics.