The budget hybrid that introduced a generation to multi-driver IEMs.
A dynamic driver plus one balanced armature per shell — the classic budget hybrid recipe. The dynamic supplies bass weight; the armature adds treble sparkle a lone driver this cheap usually can't reach.
1DD + 1BA hybrid: Two driver types splitting the work in each ear.
Four configurations: Black or Pro colorway, each with or without mic.
Who it's for
A low-cost way to hear what a hybrid adds over single-driver earbuds.
The honest trade-offs
The ZST line has been revised over the years and published specs differ by generation, so we list only what we can stand behind. Vocals sit behind bass and treble by design.
