MICROPHONE THRESHOLD

I have this sound sensor, it seems it hasn't got large scale of decibels, from 48 to 66 dB. Let's say I put threshold level to 300, what does it mean actually? I know there is some scale of 0-1024, can someone explain it more clearly, thanks. :o

There are two outputs.
You can use the pot to adjust the sensivity for the digital out.
(this can be used to trigger an event..interrupt of polled)

The analog out will saturate at some level datasheet doesn't tell. U'll have to test it