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Those subs indeed need their space 4 to 6 cubic feet per driver is what they usually are given for ported use, if will use those in your room rather than a car tuning should be in the mid 20s not in the mid 30 which is what is given for car use. It all depends on the application, you will need to be more specific on your dimensions, music you play, or movies or whatever you are doing with them, how are you powering the subs, etc.