When you have already installed some treatment and are looking for advice on how to go
forward we would normally recommend testing your room to find out what is going on and to
focus on tackling those freqeuncies causing the most problems
Here's a video on how
to do this, free software to use and what tools you will need -
http://www.youtube.com/watch?v=e4uSR3cUUSY&feature=relmfu
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David Shevyn General Manager GIK Acoustics Europe
www.gikacoustics.co.uk