Design
None of these 3 IEMs are going to blow you away with an interesting or premium design or build quality. Both the Delta and the S0 feature metal housings whereas the most affordable of the bunch, which is the Zeta, is made out of plastic.
The overall design, especially that angled nozzle reminds me of the FiiO EX1 2nd Gen, but that earphone was actually made of metal. The cable is quite thin and it does feel rather flimsy if I’m honest.
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https://www.samma3a.com/tech/en/product-reviews/brainwavz-zeta-delta-s0-review/