Please ensure that you really are using loud speaker, not onle earphone speaker.
Next, you can run application Members, there is a dignostic tool. You can check how loud the loud speaker is. If it is quiet, try cleaning it and check again.
If it doesn't help, restart the phone in safe mode and check again. If it is OK, there is an application which has impact of loudness. Youo have to find it or do a factory reset.
If nothing helps, you have to contact a service.
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