ISUDAR for MQB/VW/Golf 7/Passat/Skoda/Octavia/Yeti/Audi Car 6 Channel DSP Amplifier Speakers Audio Sound Processor USB PC APP|Stereo Amplifiers| - AliExpress
DD Audio - Very cool stealth enclosure install in the BMW... | Facebook
MB Quart Kickbass Woofer Skoda Superb II Doors Front Speaker Set 165mm Bass | eBay
Installing a subwoofer and amplifier into a 2009 Skoda Superb II + CD Tablet Holder
MDF closed subwoofer enclosure for Skoda Octavia 3 | eBay
Sub Woofer Install - Skoda Octavia Mk III (2013 - 2020) - BRISKODA