Thanks, u/DrKrepz!

Here are some Amazon offering that state (ambiguously) that they operate on 5v. Which of these would work? Thanks in advance for helping me on this!

Audio Amplifier Board, DROK 5W+5W Mini Amplifier Board PAM8406 DC 5V Digital Stereo Power Amp 2.0 Dual Channel Class D - Parameters: DROK audio amplifier board working voltage is DC 5V, output power is 5W (2Ω 5V)/3W (4Ω 5V) / 1.8W (8Ω 5V). Input method is monaural input.

MakerHawk Bluetooth Amplifier Board HiFi Stereo 2.0 TPA3116D2 2X50W 5V Audio Amplifier Module Chip: TPA3116D2 (With AM interference supperession) With or Without Filter: Yes (Filtered sound is more round and clear ) Adaption Supply Voltage: 5-27V (Optional 9V/12V/15V/18V/24V, high power recommended high voltage) Speaker: 30W-200W, 4ohm-8ohm Number of Channels: Left and right stereo (Stereo)

2Pcs Digital Amplifier Board,TPA3116D2 Dual Channel Audio Stereo AMP High Power Digital Subwoofer Power Amplifier Board 2x50W 5V 12V 24V The digital amplifier board is operated by wide working voltage DC4.5-26V(24V recommended)with reverse connection protection,and it is highly recommended for 4-8 ohm speakers;