... active subwoofer3.Shock, out of your imagination4.Oval low frequency speaker make the bass sound quality more outstanding5. Mini, portable ... iPod, iPhone, GPS, PSP, mobile phone, notebook computer, Hi-fi speaker,TF-card,U-disk.6.Perfect MID sound performance7.Strong ... High efficient digital amplifier8.Several colors and power supply manners including battery, computer USB, adaptor DC-5V allow you to ...