Acoustic Room Treatments

Joeradio,

11' x 15' x 8' is not a bad shaped room, so you should be able to treat it well with some assistance.

Give GIK Acoustics a call, and see if John Dykstra is available for a chat; Chris and Paul are also excellent, but John is who I've work most with. They'll walk you through the entire process, including the EQ Wizard software, and will make realistic recommendations based on your budget and desire.

It's mostly absorption and diffusion with proper placement, and in the proper amount......more is not always better. It's not rocket science nor complicated once you get into it.

Hey thanks for your replies. I have a basic two channel setup with Infinity RS IIb speakers so I definitely need something. 

@joeradio 

Don’t be afraid you will overdamp the room. A smaller room needs to be controlled. Plus you can always undamp it. if you are serious about this room I highly recommend consulting Jeff at hdacoustics. He is very good with smaller rooms. He designed my room and it turned out fantastic ! Good luck !

Don’t be afraid you will overdamp the room. 

“adequate” control is required, overdamping is not recommended as per acoustic consultants who see this commonly

@ghdprentice - did you hire an outside consultant for sonic analysis? I thinking about doing so in my new space.

Get a baseline measurement with REW on a laptop with a decent mic.  Experiment with speaker and listening position first and dial that in.  For early reflection points, try diffusers like curved poly's (easy to diy) if the mid and high room reverberation is mostly controlled, or absorption if the room is too lively.  Also experiment with a mix of both.  Auralex GeoFusers sound nice without any bad habits.  I like them on the ceiling over main listening position and rear wall.  4" of Owens Corning 705 will absorb well down to 80Hz and then drop like a rock below.  Pressure based diaphragmatic absorbers will need to be used for subbass frequencies (50Hz,63Hz, etc.).  Something like the BBC A10 on steroids.  And will have to be large to have enough horsepower to do any good, 3'x3' or 4'x4' each.  Or 4-5 feet thick of velocity based absorption ("pink fluffy" fiberglass).  Welti style multi subs works well for smoothing the low end freq curve compared to a single.  Have fun.