I have some 10 W, 8 Ω speakers. I'm building a Bluetooth speaker set. I've hooked up a 3.7 V, 8000 mAh portable charger battery to an XL6009 buck converter to pump it to 9 V.
I have a Bluetooth audio amplifier (not sure what class) connected. The aAmazon page for the Bluetooth amplifier states 12 V for two 10 W, 8 Ω speakers, however, the distortion I'm hearing goes on at 12 V, 14 V, and 9 V. I think it was from a question on this site that I got the idea to switch to 9 V.
I'm having difficulty measuring the current when I use the multimeter from the positive connector on the Bluetooth amplifier to the positive of a speaker, but it does play audio when I do it. I've measured the current at 0.5 A (I believe the multimeter measures in amps) when hooked up straight from the battery to a little DC motor. When I play the speakers at full volume or a bit above half way volume it's distorted and just awful sounding, and I'd like to get this fixed.
The plan is to also hook up three orange LEDs (20 mA and 2 - 2.2 V). I'm using 22AWG solid-core tinned copper wiring for all of it.
I want to know how to find the current from the Bluetooth board to the speakers and hook up a resistor to ensure it can play non-distorted at full volume (if this is the issue). I'm learning as I go so please explain fully.