Just like to send out a thanks to TC sounds for their recent support in assisting me with a recent issue I had with my LMS 5400 Ultra driver. The glue had failed that held the surround and cone together and required a replacement top assembly. The turn around time was about 2 weeks to have the new top assembly at my door step (I'm located in Australia) at no cost to me.
To anyone out there considering building a DIY sub using TC sounds drivers and are located outside the US (and in the US of course) you can rest assured if anything goes wrong with the driver, TC sounds will promptly take care of the issue for you.
So in the end paying that bit extra for the LMS-U was really worth it for me.
To improve the black level performance of your projector: Shine bright light into your eyes every 5 minutes.