I recently bought this board for a personal project for my house. I thought it will be helpful for some folks out there that are planning to buy one. The board specs are impressive but you’ll be disappointed when you learn the actual figures. It turns out, those specs are just for marketing reasons.
The BAD things about this module
Wrong Output Power Claims
It claims 120W x 2 output power but in reality it only can handle 50W x 2 output max. Why? It only have 1 TPA3116 Amplifier chip on board which is only capable of delivering 50Wx2 power output. The large heatsink made me think that it have 2 TPA3116 chip but I was wrong. Looking at the bottom it will become obvious that it is only using 1 IC.
Aux input not Working
The aux input circuit is wrong. It is connected to the output of the op-amp which is a bad idea. Although this connector is not labelled “input”. But I know most of us will assume this is an Aux input as most bluetooth amplifier have. Based on the schematic, it will work as an Aux output rather than input.
Muting the Main Amplifier when no music is Playing
The bluetooth module is programmed to automatically mute the TPA3116 amplifier chip when nothing is playing on the bluetooth receiver or it is not paired. This is the reason why there is no audible hum even if I am touching the amplifier inputs.
Annoying Power on sound
It is not an issue if you are only using it with small speaker but it is very annoying for a 100W speaker. Or maybe its just me. The power on sound is a 3 note melody if I remember it right.