Isn't a tube by definition a sealed box? Sure, it doesn't have sharp corners but it's sealed.All of the tube subwoofers I've seen in the Crutchfield catalog are ported models. The ports are located at the opposite end of the speaker. You could probably find a sealed tube if you shopped around, I've just never seen one.
In the case of the pre-built subwoofers that come with their own built-in amplifier, those are always ported because the amplifiers are underpowered and they need the port for the extra boom-per-buck factor.
Tony FabrisEmpeg #144
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