Originally Posted by pokekevin
How hard is it to induce port noise on the vtf3? Thinking about trying one
It can be done, but it's not easy, and of all the ported subs I have used, the VTF3 is the one least likely to chuff. You basically have to want to make it happen. You would have to play a deep test tone at high volume with only one port open. One should use caution when playing a deep test tone with any sub though, that is the hardest thing for a sub to do. It will heat up the voice coil and amp, and it will bring the driver to its excursion limits the quickest. It's not something that should be done for more than a moment. It can also be construed as abuse and void the warranty, in fact, here is what Rythmik has to say about that:
Abuse includes continuously playing sine wave and other test tones for an extended period. A duty cycle greater than 25% is considered abuse, where the test tone plays for 15 seconds followed by a break of 45 seconds.