i think (i could be wrong cause this is 13-10 yr old knowledge -memory-) back in the day when canton had amps (they plugged into a main board) their tweets were silk..local shop dropped them after they got out of amps. seen another system withem in '97(canton's are always called pullman) it had a metal dome as i look at the new pullman's they are metal even the mid lol very good speakers though