TWEETER	SUPREME				ELITE			CLASSIC ADVANCED
	ST1308	ST1108	ST1048	ST728	ET338	ET338-104	ET448	CAT298	CAT308	CAT378	CAT408
Acuflex™ hand treated 28mm soft dome	√	√	√	√	√	√	√	√	√	√	√
Hexatech™ aluminum wire voice coil	√	√	√	√	√	√	√	copper wire	√	√	√
Rear chamber	√	√	√	√	√	√	√		√	√	√
IDR™ (improved dispersion recces)	√O	√O	√O	√O	√O	√O	√O
Replaceable dome/coil assembly	√	√	√	√	√	√		√	√	√
Consistant quality faceplate finish		√O	√O	√O	√O	√O	√O	√O	√O		√O
Neodymium magnet	√	√	√	√			√				√
Ferrite magnet					√	√		√	√	√
Enlarged pole piece cavity							√O				√O
EVC™ (external voice coil)							√				√
Under hung voice coil	√	√	√	√
Matched pairs	√	√	√	√	√	√
Faceplate diameter (mm)	130	110	104	72	110	104	72	104	104	94	72