Well most setups are sealed but for others they use custom chambers that they build from using programs that help find out how to Tune there boxes and all. I never get rely into all that because I prefer sealed and if I do go ported there not going to be tuned for something crazy like 14 hrz. The custom boxes as I said are most likely sealed. In your z you are not going to need half of what you used in your tc. Much less air space to fill with bass. You should be good wither sealed ir ported with one sub.
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