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I'm looking into upgrading my headunit and have seem to found this behind the rear right side trunk liner in my C32. It does not look like a bose amplifier and I'm not exactly sure what it is. I've read that the non-bose W203s do not have an amplifier so I'm a bit confused. Has anyone seen this before? Also, do upgraded headunits work with all speakers/stock amplifiers (Given it is not optic fibre)?