Acoustically Transparent Screens: Putting the Speakers Behind the Picture

How perforated and woven acoustically transparent screens work, how to avoid moire, fix treble loss and plan the wall depth behind the screen.
Projector Placement: Throw Ratio, Throw Distance and Lens Shift Explained

Work out exactly where your projector goes: throw ratio maths with examples, lens shift vs keystone, ceiling mount vs shelf, and why UST is different.
What Size Projection Screen Do You Need? Seating Distance Explained

Screen size is geometry, not guesswork: use the SMPTE 30° and THX 36° viewing angles, a seating-distance table and three room checks to pick the right projection screen.