As is fairly common in mass produced cars these days, the speakers are ok but not great.
Previous smart models were generally a straight swap for speakers or, at worse, a slight modification. On the 453 however, the speakers are designed with unique mounts that you just don’t find on normal aftermarket speakers. Also, the 453 speaker grill is part of the door interior so the speakers have to be rear mounted otherwise they’ll look terrible.
That’s why you need these adapters. You get a pair (2) so all you need to do is supply the 165mm (6.5″) speakers of your choice.
The speakers surrounds just bolt in with the existing speaker screws.
Magically your stereo suddenly sounds better.
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