The corners in my room that are 2 meters high. I am building my own traps with 100mm rigid fibre. The rigid fibre is 1200 by 600 wide should I build my trap that size.
That leaves me with 800mm.
Should I build another bass trap 800 or just center the 1200 trap in the corner.
How do I keep it from touching the walls, what type of spacers are used in corners.

All of this is answered in the Forum FAQ, linked in the READ THIS FIRST post.

Here's a direct link:

Acoustics FAQ

And here's the short version which will get you 99 percent of the way there. All rooms need:

* Broadband (not tuned) bass traps straddling as many corners as you can manage, including the wall-ceiling corners. More bass traps on the rear wall behind helps even further. You simply cannot have too much bass trapping. Real bass trapping, that is - thin foam and thin fiberglass don't work to a low enough frequency.

* Mid/high frequency absorption at the first reflection points on the side walls and ceiling.

* Some additional amount of mid/high absorption and/or diffusion on any large areas of bare parallel surfaces, such as opposing walls or the ceiling if the floor is reflective. Diffusion on the rear wall behind you is also useful in larger rooms.

For the complete story see my Acoustics FAQ.

There's a lot of additional non-sales technical information on my company's web site - articles, videos, test tones and other downloads, and much more.

--Ethan

Thanks for that info Ethan
I take it from your articles you cover all room corners with good quality bass traps ceiling to floor.
Add additional bass traps at the first reflection point to the right and left of my listening position and above my head.

Cover the back wall with good quality diffusers, these would be fitted in the middle of the back right across and bass traps above and below the diffuser.
Do the the same for the area behind my speakers.
Add additional trap around the room as many as you have place for.
Is that basically it?

Yes, that's basically it! Though panels at reflection points need to absorb mid and high frequencies, where corner bass traps don't need that.

--Ethan

What type of panels are used to absorb mid and high frequencies at the reflection points.

You want absorbers based on rigid fiberglass. This is explained in the Forum FAQ linked in the READ THIS FIRST post.

--Ethan

MIDRANGE AND HIGH FREQUENCY ABSORBERS

Without question, the most effective absorber for midrange and high frequencies is rigid fiberglass. Owens-Corning 703 and 705, or equivalents....

Sorry not getting it.
Ethan what is the difference in a bass trap and a absorber???

The main difference between an "absorber" and a bass trap is its thickness, which controls how low in frequency it absorbs to. So while all bass traps are absorbers, not all absorbers are suitable as bass traps. Foam or rigid fiberglass one inch thick absorbs mid and high frequencies, but does not absorb enough at low frequencies to be useful there. When you get up to 3 or more inches thick, then an absorber can be considered a bass trap.

--Ethan

Hi Ethan,

My panels are 30"x60" stuffed with 4" of 6 pound density rigid fiberglass. Would you know what is the lowest freqency they will absorb?

John

I'm sure it will absorb down to 10 Hz. Really. But it won't absorb very much that low! Absorbing material doesn't absorb 100 percent down to some frequency, then suddenly stop. It's a gradual curve. In your case 30 inches is pretty wide, so I'm sure they're absorbing a useful amount to below 100 Hz. What matters most, besides size and thickness, is how many you have. One such trap won't do much at 80 Hz, but 12 of them sure will.

--Ethan

hi ethan, ive been reading your informative posts on various forums, but this is my first here. i was going to order a few of the compressed fiberglass pipe wraps and make tube traps for my corners until i read your post stating that they arent as effective as the panel traps, which i heeded your advice and did not order them. so now im wondering how to make my own panel bass traps? im on a budget so just simply buying a premade panel isnt posible, and get so much more satisfaction out of DIY projects anyway. can you point me in the direction of a good DIY panel bass trap thread or web-page?

also my room has a set of doorways in the left rear corner, does this make trapping there pointless?

All of this is in my forum FAQ linked in the READ THIS FIRST post. The short answer is buy rigid fiberglass four inches thick and wrap it with burlap or similar fabric. BTW, round traps do work, but they need to be large. The typical 10 inch diameter I see is not big enough.

--Ethan

Ethan,

I have 10 traps, 30"x60" in my listening room. I originally had six traps. I recently added four more and the difference was very noticable.

JK