speaker effiency

Glad I caught this b4 the flames arrived: insert "Audio Engineering Society" in place of "Acoustical Engineering Society". Whew! Thanks. Jim

Whew..... I believe you. Don't get upset. I learned something from your post. Sorry to have gotten Vandersteen in hot water but Theil and Vandersteen were the first two speaker manufacturers I thought of when I wanted to show you I have seen it both ways. Cheers....

A light when on when you first mentioned Vandersteen. I remembered in the early '80's seeing Vandersteen use "efficiency" incorectly. "Efficiency" (measured in percent) was, as I said, fairly commonly used in the early days with lower-output tube amps & high sensitivity speakers. This was later inverted. Solid state made watts cheaper, so speaker designers had the freedom to make lower-sensitivity speakers. "Sensitivity" became the term of choice. But the true original meaning of efficiency & its unit of measure (percent) has never changed. Since then people have come along unfamiliar with it. Peace. Jim

Jim, you seem to be very knowlegeable in this field. Please read my post in the "Sound Advice" catagory labeled Speaker Enclosure and let me know what you think. I have a bunch of scrap black granite from scrapped counter tops and wondered if it would be feasible to make the material into speaker enclosures. I have downloaded some software and done some preliminary calculations to see if I have enough material. It seems that I have more than enough so I was just curious if there are any caveats with the fabrication. I may try it as a winter project but thought I would run it by some people who are more knowlegeable than I before investing any time. Thanks in advance for the help.

They are quite distinct from each other. dB/watt is the sound pressure level converted from 1 watt of electrical power signal. For 'speaker specifying purposes a 'speaker of 90dB/watt is said to be more efficient than another of 85dB/watt. The numbers have little relation to the quality of sound produced. This parameter is used by audio engineers to design their products and similarly applied to audiophiles to mix and match their different choice of poweramp/speaker combination in a less haphazard manner.