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My 172 has got 13cm speakers all around, so I presume the Trophy will be the same.
As for the speakers I have got Infinity Kappa 52.9i's in the front and some Alpine SPS-13C2 in the back, I found adding some sound deadening behind the front speakers really improved the bass :approve: I spent too much on the rear speakers though, from what I read when wanting to upgrage my speakers you really only needed cheaper speakers in the back, so you're probably better off spending about £20-25 on those.