Using the headphone jack
The headphone socket on almost any electrical equipment, has stereo sound on it, but at a very low level, correct for headphones. So if you connect speakers directly to it, it will be very quiet. As mentioned by 'Tmagic650' you will need an amplified system, but will need mains voltage for it's own built-in amplifier. Another option, as I use on a desktop, is stereo speakers, powered by the USB socket. ( Altec-Lansing XT1). Power output is limited, but it's a compromise as they are not mains powered. The standard connections on a stereo plug are; far end=left signal, middle section=right signal and back section is common ground return for both channels.