Not flat or not up to 65kHz?
Each 103 is different in channel output, even new production, this is why Zu Audio divine them in 2 or even 3 grades.
But according to manual only discontinued “D” version can reproduce high frequency up to 65k (because of the elliptical tip), the rest are conical.
Each 103 is different in channel output, even new production, this is why Zu Audio divine them in 2 or even 3 grades.
But according to manual only discontinued “D” version can reproduce high frequency up to 65k (because of the elliptical tip), the rest are conical.