Here's my my project: Need a few pointers... Shiva- building a 3.17cf (~90L) for the Shiva with .75in mdf then covering it in .75 in real wood. Therefore the cabinet will have 1.5in walls all the way around. It will be a ported/sealed application (downfiring). It will be 3.0cf net tuned to 19hz. (very similar to Adire alignment). 1)How do you plug a port to seal it COMPLETELY. I'm using a 3in flared port. I'm nervous about the port leaking. 2)Does the port affect the sound of the sealed box with port plugged? Does it resonate/vibrate etc... 3)Do I need internal bracing with 1.5in walls? 4) Is a total Q of .64 too LOW for my audio needs? (my main concern) I hear you should shoot for .707 for audio. Any other advice for this project would be greatly appreciated!