SirQ,
The frequency graphs on that last link did not lead me to believe this fellow's bass traps were particularly effective at doing much of anything except changing the frequency response, slightly.
If the goal there was to curb the peaks and increase the dips, then...


If the goal is to flatten that bass area, a Berhringer unit or something similar would be far more effective per dollar spent.

"Those who preach the myths of audio are ignorant of truth."