How Much Absorbtion Is Needed

I have a rectangular room, 11'L x 8'W x 7'H, that I am converting to a studio/control room. This room will be used for mixing, and recording acoustic guitar and vocals. I have heard that rooms this small should have an unusually high percentage of absorbtion. I have also heard that a high percentage of absorbtion makes for an uncomfortable workspace. Which is correct? I will be using homemade 2'x4' mineral fiber (2"/8pcf) absorbers for treatment, if it affects your answers. Thanks in advance...

CF, > Which is correct? < Both. You want as much absorption as possible below 300 Hz, and proportionately less above that frequency. --Ethan

Based on this advice and the budget, I am thinking (6) 2'x4'x4" rigid fiber absorbers across the vertical corners and on the ceiling, then spot treat with foam for an RFZ? Am I correct that diffusors in such a small room would not make a noticeable improvement?

Recording rooms should be a bit more "live" than control rooms - for a single room situation, you might wanna look at variable treatments such as the bottom of this page http://www.saecollege.de/reference_mate ... stics2.htm Also, this may help with surface area requirements - http://www.saecollege.de/reference_mate ... m#verbcalc HTH... Steve