Trust Ziva Compact 2.1 PC Speakers with Subwoofer for Computer and Laptop, 12 W, USB Powered £8.99 (Prime) / £13.74 (non Prime) at Amazon

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12 W peak power (6 W RMS)
Powerful sound from compact design
Compact size, big sound
Bass and volume control on the subwoofer
USB powered: No wall power needed