speaker effiency

Speaker efficiency is the measure of how effectively a speaker can turn electrical energy in sound pressure. This is usually specified as db/watt. In simplistic terms, you can expect to have a specific sound pressure level for a specific power level applied to the speaker. Your power amplifier can pass more power into a 4 ohm load than an 8 ohm load, therefore, the higher power level presented to your 4 ohm speaker would result in a higher sound pressure level even though the efficiency is the same.

Spkrplus, ok, what is it? Vandersteen says efficiency is measured in db/watt and Theil specs sensitivity in db/watt. I never saw any specs in terms of percent.

Go to the Vandersteen website and look at any of their speakers specs.

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....

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.