as one of the dying breed of audiophiles, and the owner of the standard system due to it being f*g overpriced, my two pence says that the construction of the door card and in particular the ability of it to cope with pressure differential in front of versus behind the speaker cone is the most important factor. "its all about the housing"
also Harman International aren't what I would call a premium speaker brand. Neither are the bose ones audi plonk in. Put in something from B&W or Castle and I will consider it.
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