4th Generation DMT Dynamic Driver Configuration Designed for a powerful performance, the Tanchjim OLA houses their in-house developed 4th-gen DMT4 dynamic driver per side. The driver is tuned and adjusted following FEM analysis and FEA finite element analysis software for a natural and clean sound presentation. _ Exquisite Craftsmanship The craftsmanship of Tanchjim is widely praised. They have beautifully crafted all of their previous IEMs including the Hana 2021, the Oxygen, and even the budget Tanya. The latest OLA is no different here, you get transparent PC cavities with aerospace-grade aluminum alloy covers on top of them. _ Dust & Water Proof Nozzle Filter The front cavity here in the Tanchjim OLA features a SATTI filter specially imported from Italy. This filter has nano-coating to protect the IEM from Dust and Water splashes. You can use the OLA while working out without worrying about sweat or dust damaging the dynamic driver of the pair. _ Tuned Following the HRTF Frequency Curve OLA has been tuned following the HRTF(Head-Related Transfer Function) frequency curve. Tanchjim has carefully adjusted the acoustic cavity structure of the pair to achieve this level of professional tuning. The result is OLA having excellent imaging and realistic sound performance at an attractive price point. _ High-Quality Braided Cable Tanchjim OLA comes with a high-purity stock cable with standard 2-pin 0.78mm connectors and 3.5mm termination. The cable has double-core OFC wire with Kevlar fiber protected with 4N OFC silver-plated cable in a Litz braided structure. _ Specification Driver size: 10mm. Diaphragm material: Polymer Graphene. Impedance: 16Ω±10%. Sensitivity: 126dB/Vrms. Frequency response range: 7Hz-45kHz. THD+N: Connectors: two-pin 0.78mm. Termination plug: 3.5mm. _ Free: Tanchjim Postcard