Improving performance of RealTraps Mondo Bass Trap


I was originally going to purchase GIK Softfit Bass Traps because they had much better performance data compared to the RealTraps Mondo bass traps installed across a corner. However I was able to pick up some Mondo bass traps at a very good price. While I am pleased with the results of the Mondo panels I am wondering if I can improve their performance by filling the space behind the panel with some material. Would this improve the bass trapping performance? If so, what material is suggested?

Thank you.
128x128tboooe
Tboooe - Don't know Mondo and not sure what parameter you want to improve
but if it's additional sound absorption, check out a product called Roxul Safe 'n'
Sound.
Thanks Ghosthouse. Given the size of my room I have a nasty bass resonance of 60hz. The GIK SOFTFIT product performs better at this freq than the Mondo traps (at least if I am understanding the data correctly).
Tboooe - visited the Mondo site. Not exactly sure which product of theirs you bought...those triangular traps? The Roxul is a dense but cuttable unfinished sound absorbing product. Can get it at Lowes. If there is room within the Mondo product you could maybe add the Roxul to give another layer of thickness. There is some acoustical info on the Roxul product in the PDF file here:

http://www.roxul.com/files/RX-NA_EN/pdf/SnS%20Sheet_Eng.pdf