The other thread was about headunit, now is just speakers and amps [emoji16]
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Ok cool, well ECSTuning sells plug and play speakers that sound matrix I think is the brand not sure but the are a direct replacement I understand that you can always use other brand and build some kind of adapter but I have no idea about that
https://www.ecstuning.com/Volkswagen-Golf_VII--2.0T_Gen3/Interior/Sound_System/ES2857583/
That is the link for the speakers.
They also sell a Sub with amp from HELIX that goes in your boot replacing your spare tire.
I had a friend build a custom sub box for me and it sound great with the stock speakers.