For a long time, a »Blaster« was only something to blow stuff up. But this has changed in the meantime. »Blaster« now indicates that something is incredibly cool. It started with the well-known Sound Blaster. It was not meant to destroy your sound, but to blast the barriers of known sound.
To be true, the first Sound Blaster was indeed blasting sound. It sounded like shit. Amiga users were laughing about the poor samples it could play.