Fried Egg Tweeter revisions?

[Guest sbalfour]

I've got a collection of fried egg tweeters for the Advent Large,

New Advent, and Smaller Advent. Most measure 3.1-3.3ohm DCR. But

a few measure 4.0-4.1 DCR. Nothing in-between. The ones that

measure 4+ have the same inductance (~.43mH) and capacitance readings,

within a few percent. They have about the same impedance response

as the ones that measure 3.x, if one raises the graph a little to

correspond to the one ohm difference. To my ears they sound the same

as the others. The only thing I can think that would do that, is

that their winding is a finer gauge wire, but otherwise the coil

would have the same shape and number of turns. Are the 4+ ohm

tweeters some earlier revision? I've seen a description of "rev. 1"

in this forum; is that where the 4 ohm tweeters belonged?

Stuart Balfour

[Guest harley]

i don't know what the fried egg revisions are, but i have a pair Jan. 1974 tweeters that read @ 4.0 ohms and a pair of 1976 tweeters that read 2.8 ohms.

i've been curious about the difference in DCR, but don't really know what it means...anyone?

the woofers appear to be pretty consistent @ ~ 4.5 ohms.

[tysontom]

>I've got a collection of fried egg tweeters for the Advent

>Large,

>New Advent, and Smaller Advent. Most measure 3.1-3.3ohm DCR.

>But

Stuart,

I don't believe you are referring to Acoustic Research AR-3 dome tweeters when you say, "Fried Egg Tweeters." That expression was originally given to the excellent 1-3/8-inch AR-3 tweeter since it looked just like a "sunny-side-up" fried egg in a frying pan. Some people might get the Advent and AR tweeters confused.

http://www.classicspeakerpages.net/dc/user_files/2124.jpg

Acoustic Research AR-3 1-3/8-inch "Fried-Egg Tweeter."

--Tom Tyson (10Mar07)