Garansi 1 tahun Resmi The simplest way to experience Grado sound, the SR60x produces an impressive soundstage in an affordable headphone. Transducer Type: Dynamic Operating Principle: Open Air Frequency Response: 20 - 20,000 hz SPL 1mW: 99.8 dB Nominal Impedance: 38 ohms Driver Matched dB: .1 dB