Using your Daichi Rectangular Piezo Horn Tweeter Speaker is easy. First, connect it to your compatible PA system or other relevant devices like IS1200, IS15 - 150. There's no need to worry about a crossover as this speaker doesn't require one. When mounting, make sure to use the diagonal measurement of 143mm for a proper fit. As for maintenance, keep it in a dry and clean environment. Avoid exposing it to excessive moisture or dust. If there's a little dust on it, you can gently wipe it with a soft, dry cloth. Don't use any harsh chemicals as they might damage the speaker. When not in use, store it in a safe place. And remember, with our 25 - year experience in supplying parts, we've got you covered for any concerns you might have.