[. . . ] Your Logitech® speakers are quick to install, easy to use, and produce great sound. [. . . ] To learn more about Logitech® products, or for more information about Logitech® speakers, please visit www. If you have more questions about your Logitech® speakers, visit www. If one speaker doesn't produce sound, unplug your speakers and plug them in again. Make sure the left speaker is plugged into the yellow RCA jack on the subwoofer. To adjust the volume on the speakers, use the controls on the front of the right speaker. Logitech, the Logitech logo, and other Logitech marks are owned by Logitech and may be registered. English To use headphones with your Logitech® SPA 1300NM speakers, plug them into the headphone jack on the right speaker. To adjust the volume for your headphones, use the controls on the front of the right speaker. [. . . ] English To use headphones with your Logitech® SPA 1300NM speakers, plug them into the headphone jack on the right speaker. [. . . ]