First I want to thank Scott for for the info on building SuperChunk traps
I built two SuperChunk traps for the corners, and some mid-high absorbers for trap first reflections.
In addition I after reading Ethan Winer’s “Real Traps - Measuring Absorption and the Numbers Game” article I decided to attempt a design more resembling the Real Traps frame. My goals were to have light yet strong frame and to increase the amount of absorption on the 4” sides of the trap by not using a solid wood frame. After reviewing my options I decided to attempt a frame made from metal corner bead and aluminum rivets. I used mineral Wool instead of OC703.
In a word ASTONISHING! The once muddy room now sounds fantastic! I can hear pristine mixes, much sharper sound stage, clear imaging, much tighter bass lines. My studio has never sounded better! I feel like I'm finally getting to hear what my studio equipment and monitors can do.
I've put a web page together with the details of how I built these as well as the two SuperChunk Traps
for the corners. I've also included a before and after chart using Ethan's Test CD. The panels have dramaticly reduced the room's modal ringing. Fortunately the room dimensions 11'9"x18'4"x8' are fairly advantageous in terms of modal ratios.
I've also added screenshots of the calculated room modes and standing waves to my project's page:
Check it out: