SV-T550 FrequencyResponse:20HZ~20KHZ ControlRange: Bass: 12dB Middle1: 12dB Middle2: 12dB Treble: 12dB Presence: 12dB PowerSupply:9VAlkalineBattery TunerFunction: Tuner:AutoChromaicTurning Features:AutomaticlowBatterycheckLED Dimension:95.50mm(W)ⅹ52.00mm(H) InstallingDimension:84.50mm(W)ⅹ46.00mm(H)