I tried replacing the speakers and it sounded worse or roughly the same as before. This was after I’d upgraded stock CD unit to RNS 510, which was an improvement but not great coming from competition grade Pioneer head units in my previous Golf.
I put the stock speakers back in, I have the 10 speakers setup so 3 in each front door, added an amp that can connect direct into the RNS and it was much better, night and day difference.
If the car was a bit newer I’d consider adding an under seat sub also, but not worth the effort now.
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