[Jon Liu]

Plugging a port will not have detrimental effects on the sub really. You will lose some maximum output by plugging a port, but other than that nothing really.

Heat will likely not be an issue. The only thing to monitor is if you are listening to the sub and you hear some loud distortion, chuffing, or clacking then you may want to unplug the port. Those type of sounds usually mean you have reached the limits of the subs capabilities.

Hope this helps!

 

[Jon Liu]

If you are getting to the point you would hear distortion, chuffing, clacking, etc. you would need to turn down the subwoofer and/or volume before any damage is done. If you find yourself getting to that point more than a couple times, you may look into getting another sub or a bigger sub to handle your needs. Aside from that, especially in your apartment, I doubt you will get to that point often enough if at all.