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This Schematic Require voltage 9 - 18 Volt. Good voltage for this schematic is 12 V. This is Mono amplifier with output 5,5 Watt and impedance 8 Ohm. You can make this Circuit easily because i give simple and clear scheme. See this Schematic and Datsheet IC AN315 : Click to Enlarge Datasheet IC AN315 Vcc                = 9-18 V Pout               = 5,5 W RL                  = 8 Ohm Ft                   = 30hz - 18Khz Icco                = 28 mA Package         = SIP2-11 Manufactered = MATSUSHITA

THis is very nice amplifier circuit , because High output , and voltage required is also not too large, and suitable for th subwoofer speaker.This circuit use IC TDA1102 ,  Minimum require voltage 6 volt and maximum voltage 16 volt with impedance 4 ohm . This circuit perfect those of you wear the speakers subwoofer especially in the small room , like in the car. See circuit subwoofer below :