I am using a raspberry pi model B and I am trying to output sound using my new Logitech Stereo Speakers. I can't hear anything but my headphones do work. Please tell me why this happens and how I can fix it. Thank you.
The Pi's audio output jack can drive headphones/earphones but for a speaker you will need an amplifier.
Headphones Headphones or earphones with a 3.5mm jack will work with your Raspberry Pi.