mPULSE Blast & Blast Mini Bluetooth Stereo Speakers

Brasssong thought this was worth mentioning said
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For 10 bucks each, I didn’t expect much. I’m happy with the sound level when I use my Blast Mini as a Bluetooth music player. It is a little louder and more clear than my iPhone alone. Does anyone know if there is there any way to make the volume louder when using it as a speaker phone, or did I get a weak one?