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Increasing gain adds distortion, or an overdriven rock tone; decreasing gain produces a cleaner sound. 5. TONE Turn right to add treble/reduce bass. Turn left to add bass/reduce treble. 6. POWER Turns amplifier on/off. 7. POWER ADAPTOR INPUT Connect the power adaptor included with your amp here. Use only the adaptor supplied with this amplifier. SPECIFICATIONS Output Power: 4 watts RMS Frequency Range: 60 Hz ~ 6 kHz Speaker: 4.5" / 8W / 4 ohms Input Sensitivity: 26 mV Power Supply: