[funky_waves]

Here are some pictures of a TC Sounds 18" LMS5400, subwoofer we built recently. The enclosure is well braced and has laminated multi layer walls. Total internal volume comes in at 335L and is tuned to 16.5hz with dual 6" ports with 2.5" radius flares inside and out. It is 25" in diameter and 61" tall. This sub will also have a powder coated aluminum grill consisting of straight virticle bars filling the cylinder shape back in, in front of the driver. There is a 38" FW12.1 beside it in one picture.
Also attached is a REW graph at listening position before any eq, 1/3 octave smoothing, no lowpass or highpass.
I registered 116db at LP with the intro to Atlantis add 5-6db for the CM-140 at thoes frequencies= 120db+. The CM-140 read 121db at 5 feet with a 16hz sine wave. All in a 950 square foot room with 8-11 foot ceilings.