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Try Settings > Sound > mark xLOUD checkbox
Try these:
1. Try adjusting the volume of ringtones: Settings--> Sound--> Volumes--> Ringtone ¬ifications--> adjust the volume.
2. Try setting a different ringtone: Settings--> Sound--> Phone ringtone.
3. Try enabling xloud option.
4. If all this doesn't suit your need, try using your own amplified ringtone (you may amplify a downloaded sound file using softwares like 'Audacity®' on PC). Copy the ringtone to mnt/sdcard/ringtones or mnt/sdcard/media/audio/notifications and set it as your ringtone.