What of the 2 choices would you recommend for an all movie 5.1.4 system in about a 2400 cubic foot room? If ported what may I expect to notice.?
If you have no access to any EQ possibility, the ported box will definitely have more efficient low frequency response down to a lower frequency as well. The ported box is the preferred type of subwoofer box design. A sealed box is to be used when you are too limited in space for the bigger size vented cabinet.
For instance, the optimum cabinet size in a sealed box is roughly 4 cf, and you would get an F3 at 33 Hz. In comparison, the optimum vented box would have a net internal volume of 11.1 cf. This would provide a response down to an F3 at 17 Hz, roughly an octave lower.
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The rather small room size such as yours most likely will provide some boost at certain frequencies (Room gain). That is the reason why a pair of similar subs, located at the best possible positions, following listening tests and preferably with acoustics testing using a microphone, are useful to improve the frequency response linearity at the listening position.
