Logitech X-530 5.1 loud speakers ?

Very loud, good-quality speakers for your laptop/PC/iPod/iPhone/TV etc. Originally there were 5 speakers, but I seem to have lost 3 of them and just kept the subwoofer and left and right speakers (which is all you need anyway). The speakers are live (plugged in) and are connected to whatever you are using via a headphone jack. The front left speaker has an on/off button and volume control and the back of the subwoofer has base control. Selling due to lack of use (I no longer have a laptop). Cash on collection only please. Cheers System Components : 2 speakers, subwoofer Max (RMS) Output Power (Total) : 140 Watt Connectivity Technology : Wired Response Bandwidth : 40 - 20000 Hz