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The tube that someone posted up for Beetle is too big for the rears the rear window would hit it, the ones on my thread are just fine for front and back.
No the official line here is that the Altea speakers as fitted to the car are crap, obviously at some point Seat may change them, but in two year plus they haven't. The head end is fine. You can always remove the speakers with the TX screw driver and tell us whether they are made by Phillips and paper based cones. So far they have been and they are the crap ones. The tweeters aren't up to much either since there isn't a proper crossover between the mid range and the tweeters... running in parallel isn't a crossover you need a few more components for that. Thus in HiFi terms paper cone speakers, no crossover is the lowest of the lows and it sounds like it once you stop kidding yourself that it’s a new car with excellent sound. So us early adopters of the Altea ditched our speakers, least on here.