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The Celsus SA6004-155 is a speaker size reducer that allows you to install a 4” / 100mm speaker where a 4x6” / 155 x 100mm speaker would usually fit. This 3.3mm thick plastic adaptor gives you the option of transferring your favourite aftermarket speakers from your old car to a new one even if they are too small to drop in the existing location. This is a useful adaptor as some brands do not offer a 4x6 sized speaker.