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Collaboration of QKZAudio HBB. With over 10 years of professional experience in HiFi industry, QKZ has been known for its extraordinary tuning and production technique. The newly launched earphone from QKZ is a collaboration with trustworthy HBB Hawaiian Bad Boy from Bad Guy Good Audio Reviews. With HBB's years of experience and large IEM frequency measurement database, QKZ developsthis acoustic sound signature that is well-balancedin three frequencies based HBB's tuning and optimization. 10mm Titanium-Coated Diaphragm. With times of experiments, QKZ acoustic engineers eliminated ordinary diaphragms and eventually selected the unique 10mm Titanium-Coated Diaphragm to deliver a detailed, accurate sound that is different from any other product in the market. Optimized Magnetic Circuit, Double Power. Enhanced high-intensity magnetic circuit greatly improves bass performance. With HBB's special tuning, the earphone reproduces crystal clear sounds with enough bass for people who want to cra