I have searched and found many, many, many posts and sites on DIY subs and as I take the time to look at and read every single one... I thought I'd ask specifically what I'm looking for. I am thinking of building a subwoofer, or two, to use in my primary HT/music system. They will be crossed over (at 60Hz) off of the front three channels with the LFE channel thrown in during movies; so they will need to be musical, fast, accurate, yet rock the foundation when called upon. This sub(s) will be driven with a Crown K2 and EQ'd with a Symetrix 551-E. I am drawn to the D-I-Y sonotube with threaded rods as shown in this thread: Threaded Sonotube . Here are the questions I need help with in order to make a decision. 1. In the subwoofer referenced above, does the endcap over the port negatively affect the sound? 2. Given this design, what driver would you use in this sub and what type of performance could I expect from this sub with your suggested driver? Driver cost limit $400. 3. Is there a best site with step by step, detailed instructions on how to build one of these? Thanks for all your help!!! ------------------ Take Care, merc ------------------ DTCP, DFAST, 5C, DVI, and HDCP smell like DIVX!!!