Review on DAMGOO Bluetooth 50W+50W Stereo Audio Amplifier Board: Wireless DIY Speakers with Treble and Bass Control, BT 5.0, AUX Inputs - Easy Installation, Password Free by Andres Imaging

Random woodpecker sounds, especially at low frequencies. A humming sound that starts at 50% of maximum volume. Update: The seller's post indicates that the problem was likely caused by low powered speakers that cannot handle the power output of the amp. As I bought this amp to drive these speakers just removed from an old TV I have returned the product and cannot confirm this. ========================Original message from seller: We spent a day testing several speakers and now we have found the problem. The problem is that your speaker is a mid-tweeter and has a square shape. Your speaker power is estimated to be around 10W~15W, and the output power of the audio amplifier board can reach 50W+50W. This leads to the following two results: 1. The output power of the audio amplifier board is much larger than the rated power of the speaker, and there is a very high possibility of damaging the speaker.2. The audio amplifier board has a bass boost control. If the bass is boosted because your speaker power is too low and it is a mid-high speaker, part of the bass frequency cannot be reflected, resulting in distorted sound quality. It's a woodpecker sound. It is recommended to replace the speaker, preferably a full-range speaker and a round shape, with a power of more than 30 watts. We hope that we can help you solve the problem. If the problem is still not solved, please let us know. We will give you a 100% satisfactory answer!