I think that on my samsung J5 with 4.1 bluetooth, the music on wireless speakers sounds more silent then on the other my friends newer phones.
Thank you! The answer i was searching for.The only way i can make it louder is i guess changing treble and bass, right? I biught JBL charger 4 speaker and i thought it will be louder...The volume is generally dictated by the properties of the bluetooth speaker, not the phone. There might be a small amount of difference on phones with stronger signals, but it would likely be pretty minimal.