JohnGreenArt said:The "Imperial troops have entered the base" line could sound more urgent just be speeding it up (though making sure it's not pitched up). If it's just said faster, it will sound more like the person ran to the intercom to get off the warning.
That doesn't necessarily need to be sped up, but if a blaster sound or two could be added in between the line and the static...
"Imperial troops have entered the base! Imperial troops have --"
2 blaster shots
static