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How many decibel are you comfortable with when it comes to boosting?
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That's up for debate. I wouldn't go much past about +5dB. Any gain filters require that the input level is decreased. This adds noise and decreases the number of bits available in the ADC. It's up to you how much you're willing to lose.
Cut as much as you like, but of course, this lower the output level of the FBQ at that frequency. Sometimes you can cut so much and so wide that you're left with nothing...
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Also at what smoothing level in REW should I be working with the FBQ to smooth out my room response?
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This doesn't really make sense. Smoothing is applied to REW graphs to get a better representative feel for trends of the signal. At higher frequencies, the combing is so bad you can't even see the signal, so you use smoothing. Smoothing is never applied to low frequencies (15-100Hz), and especially never applied before filters are created in REW as they won't match the modal response of the peaks properly.
brucek