Aloha and welcome to the forum, volker
:D
I know that there's a little too much High/Mid absorption (dead room), this should also be improved, but this is not the main problem. The real main problem is that there is almost no bass at the listening position and there are multiple nulls / frequency dips and resonances. Would realtraps and/or well-placed Auralex LERNDS or other Auralex products help? At first, i will now move the Listening position to 38% of the room length. What do you recommend?
Congrats on your studio build! Any chance you could please:
Edit your profile to include your location. This is very important, because this is a worldwide resource, and as such, material costs and availability vary widely. For example, masonry is cheaper than gypsum in some parts of the globe, whereas it's the exact opposite in other regions.
You'll probably get more of a response by doing so and this will really come in handy two or three posts down the road. It's also part of the forum guidelines:
http://www.johnlsayers.com/phpBB2/viewtopic.php?t=3231 Thanks!
Here's a couple of places to get an idea of what's involved:
SAE Website:
http://www.saecollege.de/reference_material/index.html
(be sure to click on the acoustics, absorbers, construction tabs at left, and tabs that appear at the top of the pages)
Wall Units -
http://www.johnlsayers.com/HR/index1.htm
Recording Studio Design Forum Reference Area:
http://johnlsayers.com/phpBB2/viewtopic.php?t=2125
More Useful Links:
http://www.johnlsayers.com/phpBB2/viewtopic.php?t=1168
A couple of questions for you:
Are your measurements in meters/milimeters/centimeters/other?
What is the ceiling height?
And finally, a few diagrams attached for reference.
Looking forward to your build!
Aloha
8)Image not preserved: John's Room Treatments 1.jpg
Image not preserved: speakers1_193.jpg