The JBL AM4215/64 loudspeaker pair offers reliable performance. Note that the grills have some rust, but this does not impact the functionality at all.

Using these JBL loudspeakers is easy. Just connect them to your audio source, like a mixer or amplifier, and you're good to go. As for precautions, make sure to place them on a stable surface to avoid any accidental falls. When it comes to maintenance, although the rust on the grills doesn't affect performance, you can clean the grills gently with a soft brush to keep them looking decent. Also, store them in a dry place to prevent further rusting or damage.