To use the Meyer Sound DF-4 loudspeaker pair, first place them in a suitable location for medium - throw audio coverage. Connect your audio source to the speakers. Remember, you'll need to provide your own power cable to plug them in. When it comes to maintenance, keep the speakers clean by using a soft, dry cloth. Avoid exposing them to extreme temperatures or humidity. If you notice any issues with the sound quality, check the connections and make sure your audio source is working properly.