Using the Kanto YU4 Powered Bookshelf Speakers is a breeze. First, connect the speakers to a power source using the provided power supply. Then, choose your input method. You can use the 3.5mm AUX jack, RCA L/R inputs, optical links, or connect wirelessly via Bluetooth. If you're using a turntable, just plug it in thanks to the built - in phono preamp. Use the single - knob control on the front for basic adjustments or the remote control for more detailed settings like input selection, volume, tone, and Bluetooth pairing. When it comes to adding more bass, connect a subwoofer to the subwoofer output. For maintenance, keep the speakers in a clean and dry place. Avoid exposing them to extreme temperatures or humidity. If the speakers get dirty, use a soft, dry cloth to gently wipe them. And don't forget to change the batteries in the remote when they run out.