Active subwoofer are the perfect choice for anyone who wants to have brutal bass without having any hassle with mounting or working on his car. ETON presents the new 8" and 10" active subwoofers. Amplifier and subwoofer are in one cabinet. The amplifier has powerful 160 Watts and guarantees punching bass. The best thing about the USB is their size indeed. Both fit perfectly under the driver- or co-drivers seat. Minimal 7,4 cm height allow the USBs to be placed anywhere invisible and space saving.
 
Review: 
https://www.eton-gmbh.com/fileadmin/user_upload/Produkte/Car-Hifi/Aktivsubwoofer/CarHifi_4_2013_Test_USB8_10.pdf