In KDE3 console, the beeps could be disabled from Settings > Bell.
Strangely, I couldn't find any such option in the new KDE4 Konsole.
It has tonnes of new features, but the bell option is hidden somewhere. Let us see how to disable it.
You could start with the following commands
xset b off
setterm -blength 0
If nothing works, best is to switch off the bell from the your profile's inputrc file.
echo 'set bell-style none' >> ~/.inputrc
Great!! Another annoyance solved. Enjoy using KDE 4.
PS: To all the fanatics who are criticizing KDE 4, be patient and give them more time. I bet it's gonna be awesome when KDE 4.1 comes out.
[Src: Debian-Admin ]