I have read everything I could find online about bass traps and other acoustic treatment by Ethan Winer and Jon Risch. First of all, they are the s*** when it comes to awareness of the importance of acoustics. I had spent thousands of dollars on equipment before becoming aware of this problem and always wondering why nothing I tried improved my sound. (aside from being a recording dummy

)
I have already built diffusor panels for high and mid frequencies. However, the bass traps are a different thing, because I need to be able to move them to and from my recording space, which doubles as an office. Now I found this link:
http://geekwithfamily.com/2006/09/05...ikea/#more-157
Don't you just love Ikea. First of all, this is finally a product that is also available in Europe and it's portable and really quick and dirty. What if I stuff these polyester bags full of rock wool to the breaking point and just zip it up? Would that be sufficient? According to the sizes on the Ikea site, they should suffice.
Width: 13 3/4 "
Depth: 21 5/8 "
Height: 47 1/4 "
Width: 35 cm
Depth: 55 cm
Height: 120 cm
What do you guys think? Also, what kind of effect would they have on mid frequencies? I mainly record solo acoustic guitar, so I am not even sure that requires bass traps but it's the low-mid frequencies that often bother me (750-1000Hz). I hate that honking nasal sound.
I'd love to hear what you guys think.