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Tidesmit HIFIMAN HE-R9 Closed-Back 98dB Sensitivity Studio Headphones Ships From:Poland real-time blood pressure and heartExperience Pure Acoustic Isolation HIFIMAN HE R9 is a studio headphone designed for audiophiles who demand pristine clarity. These closed back headphones utilize cutting edge technology to deliver high fidelity sound without external interference. The Problem We Solve Standard audio gear often suffers from acoustic bleed and environmental noise interference. The HIFIMAN HE R9 resolves this by creating a sealed acoustic environment that preserves every