Description: Pure power amp is simply the volume of the amplifier, without preamplifier circuit, audio input directly promote the pronunciation without any modification after speaker amplified sound authentic, pure and natural. The amplifier board is pretty sound using two classic ST's TDA2030 amplifier IC composed of pure power amp, single power supply, input voltage single supply AC 9V-15V. Rational component layout, strong power (15Wx2), almost no static noise , an excellent sense of hearing, fewer external components. Easy to install, very suitable for conversion or installation of home audio system. Widely used in a variety of speakers. Specification: Input voltage: AC9-15V or DC9-15V (DC input note to distinguish between sub-polar, AC input, regardless of polarity) Output power: Po = 15W + 15W (RL = 4Ω) Output impedance: 4-8Ω PCB Size: Approx. 64x54x20mm / 2.5x2.1x0.8inch Material: FR-4 Package Includes: 1 Piece of Power Amplifier Module