I have had many requests for details on how I built the theater, with many
of those requests about the subwoofers in the floor. I didn't take too many
pictures while building it, but I did find these snapshots. Not the
best photography, but I hope better than nothing. Take the time to bring up
the pictures as I have added text to some of them pointing out some of the
Here is a copy of the original sketch I made where the elevation of the
speakers, screen, platform and chairs was decided in order to ensure a
good view of the screen from the rear row of chairs. At this time the
projector location was not decided. You can also see the Triad THX side
This picture is taken from the right rear of the room showing the
platform that the rear row of theater chairs is mounted on. Inside of
it you can see the location of the two 12" subwoofers that have
enclosures below the floor between the floor joists. The subwoofers are
mounted in a channel that goes fully across the platform, out each end
and into the front center of the room.
This picture is taken from the right front of the room, looking back at the
platform. You can see the front row theater chair supports, and the exit
opening for the platform subwoofers.
This shows the actual sub enclosures just prior to the tops being sealed
and attached. You can see the insulation inside them as well as the 4" ports
that are attached to the tops.
This a picture of the front of the finished platform with the floor installed.
Here you can see the exit opening at the front of the platform for the
This is a picture of the finished platform right end showing the exit
opening for the subwoofers.
This is the front cabinet under construction. It is built from 3/4" birch
veneer plywood and has many, many coats of paint on it.
This is the ceiling subwoofer under construction in the attic. It has two Petras
18" subs in it and ports into the room via eight 4" PVC pipes.
The enclosure is made from 1-1/4" MDF particle board. It is designed to straddle
two of the ceiling joists. I assembled it in the attic not only because it was
too big to carry it up the stairs, but because it weighed a ton.
This is a view of the huge subs mounted in the internal baffle.