¿Something like this?
`printf "%76s"; echo "$'\x14\x84\x04\x08'"`
If do you want to print the hex characters:
`printf "%76s"; echo $'\x14\x84\x04\x08'`
Is recommended to use the dollar sign and parentheses instead of backticks:
$(printf "%76s"; echo "$'\x14\x84\x04\x08'")
Or
$(printf "%76s"; echo $'\x14\x84\x04\x08')