Review on Nobsound 100W TPA3116D2 Mono Channel Digital Power Amplifier Board NE5532 OPAMP 8-25V (Mono, Full Frequency) by Matthew Maxwell

It's a small, light, well built device that will kick your ass. I used a cheap 4 inch speaker for testing and it's amazing. At 50% volume it hurts the ears, at 65% the speaker jumps. I thought full sound would probably destroy the speaker so I stopped. I used a 3.5 stereo to mono jack cable and had no problems. The only improvement I would suggest for the manufacturer, or for you, is the addition of a tone control. Outputting with a small speaker and a high frequency sound source or high overtones is a bit harsh, especially when you turn it up. If you're using this for a subwoofer or bass sound, it's not a problem. It's easy to add a 0.047uF capacitor from the input to the center tap of the 500k potentiometer and ground one of the outer tips of the potentiometer. Soften it if you like. UPDATE: I tried this with some other speakers. 6" 40W 3-way marine speakers and 6 x 8 60W 3-way car speakers. With these top-of-the-line speakers, the fidelity is very good and there's enough power to overwhelm the speakers. This price is incredible value.