Nobsound&reg; Bluetooth 4.0 Amp Digital TPA3116 2.1 Channel Subwoofer HiFi Amplifier This is our Douk audio own brand Nobsound, British CSR8630 4.0 HIFI Bluetooth receiver chip + TPA3116 digital amplifier chip, Cost-Effective and high performance, Mini and compact, High-Power with HiFi good sound and very useful, accessories complete, almost match any speaker on the market, the most perfect 2.1 digital integrated amplifier, you deserve to have. Nobsound NS-09G is an integrated amplifier with bluetooth function. Using two TPA3116D2 digital amplifier chip as the core, one do a left and right channel power amplifier, and the other bridge driver subwoofer, with small size, high efficiency, high power characteristics. Regardless of the cost of materials, capacitors Philips, Thomson, ruby. Taiwan-quality sealed potentiometers, original TPA3116D2 chip, SMD chip devices, and so on. Left and right channel output 50WX2, subwoofer output 100W, efficiency can reach above 90%. Support analog signal input and Bluetooth signal input, Bluetooth input priority. With High-quality power adapter: Input 100-240V / Output 19V_3.42A high-quality power supply, 1.5M long full copper power cord the potentiometers from left to right: STEREO, BASS and TOTAL volume