Harbeth 30.2 vs kef R3

[avanti1960]

Soft dome tweeters tend to sound a lot different from metal dome tweeters as well. A speaker engineer once told me metal tweeters can be constructed much flatter than soft domes and end up having much better high frequency dispersion as a result. That may be what gives metal tweeters their "metallic sound", i.e, just more energy above 5k with a 1" tweeter in-room typically.

not so. it is all in the application. there are poorly executed applications of soft domes and metallic domes and vice versa. i have (an own) metallic dome tweeters that sound natural and not metallic at all. many unfortunately do sound metallic but not the best applications.