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The HDS 7 has been commented on in forums as having a low alarm volume and no way to turn it up.
Or perhaps it is just that the one case commented on has an abnormal low volume level prevalent on its alarm.
Look for an audio-output jack on the HDS 7, and see if an external speaker for the alarm can be set up, plugged into it.
If your HDS 7 is less than a full year old, it could still be serviced under warranty... but if over a year from the purchase date, it is out of warranty in all likelihood.