professional music speakersAre professional speakers good when you use them for general music listening? Like some KRK speakers?

Good for what? Loud yes, sonically accurate NO! Most "professional" (DJ) speakers are designed to be LOUD. They use horn loadingprofessional music speakers for the woofer and piezo tweeters or horn tweeter and midrange. Again very loud but not very flat response. If you want to hear a reprofessional music speakerscording that sounds like the recording engineer mixed it the you need accurate speakers, if you want club type loudness then yes.