Strong Headband. Low Frequency Response. 3.5mm Jack with 1/4″ Jack AdapterResponse: 20Hz-20kHz Sensitivity: 104db Impedance: 32 Ohms Power Handling: 500mW Weight: 350g. The HP-565 studio headphones boast a strengthened headband for strong hold. Low frequency has been emphasized to delight both professionals and consumers.. headphones