I had ordered 2 system between 40 and 60 euros, once the Sony SRS-D5 and the Speedlink Gravity X-XE 2.1. After extensive testing, I am to keep the background gave birth the cheaper Sony system as it is the high tones more clearly reflects as the Speedlink. When Bass the Speedlink is slightly stronger.
Pro: - Clear treble / mid - Good bass, but could be a little stronger
Cons: - Short Cable - Unprecedented connections => lengthen the cables is difficult