Sony speakers? Come on dude, you can't use home audio speakers for parties.
The only speakers that will be up to par for DJing are professional PA speakers. Anything else is asking for trouble, car speakers, home theater, computer speakers, audiophile speakers, none of it will be good enough for live playing. If you do parties there is no excuse not to have real PA speakers.
I think everyone is missing the main problem here... Use the right speakers for the application. Even the best studio monitors aren't up to par and will cause problems if you try to use them for a party or any live setting.
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