Item Type: Subwoofer Speaker Amplifier BoardMaterial: PCBCore Chip: TPA3116D2Operating Voltage Range: DC 925V (current 34A Or Higher, If More Power Is Needed, 1924V 45A Or Higher Is Recommended)Sound Input Sensitivity: 500800mVFrequency Response Range: 20Hz to 20KHzSpeaker Impedance: L R CH Speaker 3.58BASS Speaker: 28Maximum Output Power: 50W (L CH), 50W (R CH), 100W (BASS CH)Size: Approx. 101x100x30mm/3.97x3.94x1.18inPackage List1 x Power Amplifier Board4 x Screws4 x Studs1 x 3Pin CablePlease allow 13mm differs due to manual measurement. 1MULTIFUNCTIONAL: Subwoofer speaker amplifier board is with the pre amplification, bass divider processing. 2SUPPORT FUNCTION: 2.1 power amplifier board with bass, left and right channel volume adjustment, treble adjustment, total volume potentiometer control. 3HIGH POWER: Power amplifier module is using DC 1224V power supply, Maximum support 50W(Left CH) and 50W(Right CH) and 100W(BASS CH) three channel output. 4POWER SAVING: Super bass speaker amplifier board has wide operating voltage, power saving design, the efficiency of up to 90% or more. 5ANTI SHOCK PROTECTION: Digital sound amplifier board with boot anti shock protection design, boot no burst sound.