Speaker cabinets contain the drivers and are responsible for handling the other 50% of the energy that is not transmitted forwards to the listener.  This can either be damped or ported out of the cabinet.  The cabinet should not add it's own "colour" to the sound, and is simply there to present the drivers to the listener. 

A simple test for this is to knock the side of a cabinet and listed for any hollow boom sound - If easy to generate, this resonance will be create by the pressures of the drivers and add to the audio program emmited by the drivers, this additional pressure is noise and to be avoided at all costs!  

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