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@spacelord I added the Helix in my NX3 Vrs and the sub clipped and sounded crappy. After 2,1,3,4 we are and business and a total swift in bass and sound quality. Also I inverted my wife's 5E3 sub and also the game changed. So, from my opinion, all Octavia Cantons are screwed from factory.

Also, please check and do this with the Hi-Low input:

Yes, but: You need power to the sub You need to grownd the sub to the chasis You need the Helix AAC.3 HP Hi-Low adapter to trick the can speaker checks and get an output/rockford input signal You can't feed the Hi (Direct connection of the sub speaker wires) to the Rockford Get the Helix, select Lo (Low) input on Rockford and enjoy

Dear gents, After months of researching today I decided to open an account here and share with you my findings. Having 2 Octys with Canton, One 5E3 and one NX3 VRS and both sounding as crap I decided to add an AM subwoofer. For all the members and other parties interested in this, the adapter HELIX AAC.3 HP is able to bypass the Canton protection and provide both a signal and a Remote signal. So, to add an aftermarket subwoofer to any Canton system on Skodas, use the adapter but choose the HP one. It is literally plug and play with no issues. Now, after adding the JBL BassPro Hub and the adapter the bass was not so punchy and on high level peaking and sounding like crap regardrless of the focus Front, Driver etc it just didn't sound right. This evening I decided to switch the polarity used to input the Hi-Low adapter as described here using the aftermarket plugs or pin switch. I can state, not say, that Yes, the polarity in ALL of the Skoda Canton system is reversed at the subwoofer output and regardless of keeping the original 8X8Ohm sub or placing an after-market adapter and sub, reverse the pins, just put + to where - should be and you will be amazed. The bass is now clear, punchy, deep and no clipping in the AM Subwoofer. Given that is very hard to find and test this kind of info about polarity and Hi-Low adapters that can trick the Can protection I really hope that for future searchers this info will be usefull. Best Regards, Bogdan