These Electro - Voice EV ELX112P loudspeakers are easy to use. First, connect them to the correct power supply to get them working. When using, make sure the audio source is properly plugged in. As for the issues, the dent on the channel 1 input connector might not affect normal use too much, but just be a bit careful when plugging in cables. Since the input 1 knob covers are missing, don't apply too much force on the knobs. To keep them in good shape, clean them regularly with a soft, dry cloth. Avoid exposing them to extreme temperatures or humidity. And when you're not using them, store them in a safe and dry place.