Does anyone have a resolution for ringer volume on 4S not being loud enough?

I have an I-phone 4S -I have the ringer volume as loud as it will go and it's not loud enough. I have a lifeproof case and if I leave the charger flap open, it's louder - defeats the purpose of the lifeproof case. I downloaded a ringtone and that helped a little but, if I am not in the same room or a TV is on, etc, I cannot hear the phone. Other people seem to be having the same issue. If the phone is on me, I can use the vibrate but, that, too, is a work around. What is it with the I-Phones and volume issues.