Fiio AM5 High Power Headphone Amplifier for X7 Music Player, Titanium,Grey FiiO AM5 High Power Headphone Amplifier - FiiO 1 Year Limited Warranty Output Power: Greater Than 800mW(16Ohms/1 kHz)Less Thanbr 500mW(32Ohms/1 kHz)Less Thanbr 55mW(300Ohms/1 kHz) Channel Separation: Greater Than 72 dB(32Ohms / 1 kHz) Peak Output Voltage: Greater Than11Vp -p Frequency Response: 9Hz - 84kHz(-3dB)