Room Treatments added, with negative effects..


Hi Folks:
I purchased a set of foam acoustic room treatments and set them up in my listening room. It now seems that the soundstage has collapsed somewhat, and the sound is less ambient, filling the room less. I'm wondering have I overdone the treatments, or placed them incorrectly or maybe I really just didn't need them to begin with. Can anyone offer any advice or thoughts?

I purchased 12 24inch by 24inch panels of ProFoam treatments from Audioadvisor.com which were pretty reasonable at about $150 for the set. I set up four panels behind the speaker position going from left to right at about 20 inches above the floor, and seven panels behind the listening position (three from left to right about 10 inches above the floor and the other four above those from left to right). Side positioning wasn't really possible because I have glass doors on one side and a corridor on the other.

My system is Audio Physic Virgo, Supratek Syrah pre, Blue Circle BC2 monos, Teres 135/OL Silver/Shelter 501mk2 vinyl rig.

I'm keen to hear any comments or advice on how I can improve my use of the room treatments, or whether I just need to scrap them. Thanks!
Outlier.
outlier

Showing 2 responses by gbmcleod

The Tube Traps are very helpful in taming room acoustic problems. I know; I've had 30 of them since 1988, when Stereophile first reviewed them.
HOWEVER, you can NOT simply place them and forget them. You must tune them carefully, by moving them along the side wall (if that's where you are using them). Try moving them 1/8 inch at a time, with the reflective side facing into the side wall, and them rotating the seam TOWARDS the speaker.
For a more detailed setup of them, go to Peter Moncrieff's classic article on Tube Traps. Here's the website: http://home.wanadoo.nl/thingman/trapart4_u.htm

This is an EXCELLENT article on how to optimize the Tube Traps. I used it to great effect when I had WATTS (the first 3 generations of them).
You can also buy some RealTraps, which I recently purchased. They are as effective (in the bass especially) as Tube Traps. Their website is: www.realtraps.com. They are MUCH less expensive than tube traps and work quite well at ceiling/floor junctures, as well as placed in corners. I was quite surprised at how much they cleared up the bass range; I put the Tube Traps in the same positions, and they're about equal in their effectiveness. HOWEVER, the tube traps have the advantage of absorbing AND reflecting, while the RealTraps, which work as well, don't allow for tweaking. The good thing about the RealTraps is that they come with a 30-day money back guarantee, so if they don't work well (unlikely), you can request a refund. I can tell you that a few people at TAS are using them, and I'm loaning a couple of mine to the Sea Cliff gang (although, they could clearly ask for their own!).
Finally, the Tube Traps, once you place them along a wall, MUST be rotated in tiny, tiny, TINY increments. Forge about 1/2 inch rotation: I'm talking about a 1/100" rotation. Trust me, it changes the sound in quite tiny increments. I think, as HP said in a past issue, that people don't use them right at all. They turn them 2" at a time: WAY too much. You'll have to experiment with them. It's the difference between good and excellent when you rotate the columns.
Bombaywalla:
I assure you that I wasn't suggesting that your advice was incorrect in any way. Consider my comments an addendum to yours, in case Outlier wanted to use Tube Traps. I've seen them placed wrongly in many rooms. Even reviewers install them wrong, as when Tom Miiller of TAS had RoomTunes in his room and wrote an article about the designer coming into his room and completely changing their position. Also,in an old issue of TAS, HP averred that the Tube Traps were helpful but that the instructions were not. Moncrieff's article is the best one so far.