I have a small, portable, battery-powered Bluetooth speaker (has aux input) and an XLR microphone (Shure SM57). I was wondering if there is anything I could use to convert the microphone signal to 3.5mm so I can use the speaker as a mini amplification system, without needing to use a power cord. I know there are XLR-to-3.5mm adapters, but I'd also like an adjustable amplification knob or something so I can get the volume loud enough.
Is this possible, or would I need a mixer that needs to be plugged into a wall? I really don't need to "mix" anything--just amplify it enough to be at a good, standard signal strength for the Bluetooth speaker. Preferably, it would be something very compact. Is there any device like this I could use?