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  1. Projector height calculations.

    System Setup and Connection
    Hello everyone. I am trying to determining the correct altitude for the projector. After going through the Calculator Pro I did not see any input or output specifications for the proper height of any given projector. I know most projectors have minimal horz. & vert. offset adjustments. My...
  2. PB13-ULTRA port calculations ???

    Ported Subwoofer Build Projects
    Trying to figure out how the PB13-ULTRA calculated the 3 port lengths ?? Has 3 ports of 3.5" diameter and about 27-30 " long each ?? { inside box pictures show ports, front to back with elbow up another few inches for each one.) Tried using a port calculator but not even close???
  3. Foot Lambert Calculations for 2.35 Screen

    General Screen Discussion
    I had a quick question about calculating foot lamberts for a 2:35:1 aspect ratio screen when an anamorphic lens is not used. When calculating foot lamberts for a 2.35:1 aspect ratio screen, do I use the screen area or do I have take into account the black bars? I do not plan on using an...
  4. Sealed Sonotubes - How to fill with pollyfill and calculations

    DIY Subwoofers - General Discussion
    I am looking to extend the extension of my dual stacked 6'cu 19ov.02 sealed sonosubs. I really don't want to disassemble them and add poly fill unless it is worth it so that leaves me with 2-3 questions: 1. Can pollyfill rest on the back of a woofer on a downward firing sono? 2. How much...
  5. Verify my sub calculations

    DIY Subwoofers - General Discussion
    I think I may be close here finally. Driver I'm using Dayton DVC385-88 over the RSS390HF-4 with the Bash 300 plate amp. 6" port @ 24.75" long. Here is what I came up with. Before I start building, I wanted to be sure I'm in the ballpark.
  6. Check my box calculations

    DIY Subwoofers - General Discussion
    I worked up a box for my subwoofer. I don't need it to go to 20Hz I just want it to sound good and if it falls off the map on lower registers thats fine just so long as it sounds good above that and not boomy or bad. Here is what I came up with. Will it need an EQ, or do you think it will do...
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