Bang & Olufsen BeoLab 4 PC Computer Loudspeakers (Black) he ICEpower amplification used in BeoLab 4 PC is a patented Bang & Olufsen solution, allowing for ultra-compact design, high power output, and cool operation. Each speaker contains two separate amplifier units  one for treble and one for bass. Adaptive Bass Linearisation, another proprietary Bang & Olufsen technology, offers superior bass performance from small loudspeaker cabinets. The commanding performance in the low-end register effectively eliminates the need for a big subwoofer. Circuit protection technology ensures BeoLab 4 PC never overheats.