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Harman Target Version Based on the Castor, the Pro version further refines the frequency response cunve to better align with the Harman targeted cunve. This upgrade not only delivers a significant improvement in performance parameters but also sets a new benchmark for sound quality. Haman Target With lmproved Bass Version Based on the Harman target version, we have launched a Harman Curve Bass-Enhanced version, which achieves dual improvements in sensitivity and dynamic perfomance in the low-frequency response. At the same time, the mid and high-frequency ranges maintain a high degree of consistency with the Harman curve, resulting in a significant overall enhancement in sound quality. Castor Pro features dual dynamic drivers and precise electronic crossover technology. Independent Low-Frequency Driver Redefine Powerful Bass. Professional-Grade Electronic Crossover Technology. Integrated High-Precision Acoustic Tuning Switch. Zinc Alloy Integrated Die-Cast Casing A Model Of Light Luxur