[mfsoa]

I know the ultimate answer is "Where they sound best" but I'd like to bounce two choices off of you.
I have 4 more D1s on the way, and I'm quite sure that 2 will be going on the front wall, at speaker level, outside of the speakers, between the 244 panels:


The other two D1s can go on the front wall between the speakers, on top of the horizontal 242 panel above. This would give me a nice arc of 6 D1s around the speakers. FYI the speakers have an adjustable-level rear-firing ambience driver, so the treatment of the rear wave plays a very noticable role in the sound. (If I move the D1s shown above 2" closer or farther away, the effect is readily apparent)

Or, I was thinking of replacing the upper, center 242 on the back wall with the two D1s:


This would free up one 242 that I like to put horizontally on the floor in front of the rack, which blocks reflections off of the gear. I see the advantage of this approach as creating a bit more acoustical life in the room instead of totally killing rear-wall reflections which really deadens things. And in my 13' room I may be able to get some rear ambience, which I have been trying to eliminate due to the proximity to my noggin.

So, in one case there is a lot of diffusion at the front wall, or I can split it up and put some on the rear wall. Keep in mind that the room is only 13' front to back.

Maybe I'll have to get two more so that I can have the 6 on the front and the two on the back 

And then there is the variable of angle - The D1s do vastly different things when rotated 90° - Put the ribs horizontal above my head on the rear wall and there will be lots of sound bouncing down on me, which may be good or bad.

You can't see it but there is a 242 on the ceiling at the reflection point.

Any opinions? (other than "Gee, you sure have a lot of panels in that room!)


-Mike

[zybar]

Not sure about the GIK diffusers, but I have some RealTraps diffusers and they worked better behind my listening position rather than behind the speakers (just like Ethan said they would).

What does Glenn or Bryan suggest?

George

[TomS]

That room looks great.  Never can have too many traps IMO.

Glenn showed a new maple wood diffuser that he said would work great if you have about 5-6' behind the listening position.  They are 2x4' and come in multiples, though were a little pricey.  It's definitely worth looking at for that application, so I'd give them a call.  Realtraps has one that is optimized to be placed fairly close to the listener, so that's a good option too.

Tom

[biz97]

Mike,

  When I picked up my D1's from GIK, it was suggested (by Frank and Bryan) that I place two behind the seating position up high on the ceiling (like you were thinking) and two AT the reflection points.  Bryan had suggested that I place my panels above my head.  So I have the panels above the seated area and 2 D1's at the reflection point.  It definitely opened the sound up but I can say that I found the biggest improvement came from the absorption since I sit so close to the back wall (between 3 and 4 feet).

[mfsoa]

Hi Biz,

For the D1s above your head, have you ever tried rotating them 90° so the ribs run vertically?

Thanks for the tips, everyone.

-Mike

[satfrat]

Ya'know Mike, what you really need are a couple of GIK Table Taps om each end of them recliners.



Or maybe a couple GIK Elite Pillar Bass Traps for each corner to your loudspeakers. They could be used as plant stands for some silk plants if you don't have available lighting? Bass Traps would definitely unmuddy the bass,,, tighten it right up which in turn will help the whole frequency range. Works for me except I use a Real Traps Soffit Plant Stand but i do have the GIK Table Trap(s).


You might possibly want to treat the ceiling also. Looks like your ceiling is much higher than my 7' ceiling but a (very light) Furutech Diffusion Panel @ the 1st reflection point on my ceiling did wonders for my smallish room.


My 2 1/2 cents.
Cheers,
Robin

[mfsoa]

Hey Robin,

In my almost 13 x 18 x 8' room, I already have 20 different panels up    with 4 more on the way!

Mostly GIK 242, 244 and diffusers but also 8th nerve and some older ASC I had laying around.

I love the look of the upscale GIK stuff and the RealTraps too, but this boy went for the cheap (yet effective) stuff.

Got the wall intersections bass trapped, the ceiling corners traingled, ceiling itself GIK'd.

The room reminds me of "Goodnight Moon" except instead of the old lady, it's my room that is "whispering hush"

[satfrat]

Hey Robin,

In my almost 13 x 18 x 8' room, I already have 20 different panels up    with 4 more on the way!

Mostly GIK 242, 244 and diffusers but also 8th nerve and some older ASC I had laying around.

I love the look of the upscale GIK stuff and the RealTraps too, but this boy went for the cheap (yet effective) stuff.

Got the wall intersections bass trapped, the ceiling corners traingled, ceiling itself GIK'd.

The room reminds me of "Goodnight Moon" except instead of the old lady, it's my room that is "whispering hush"

HEY, (Buddy quote )

Looks like we're not that far apart room wise, mine's 11' x 17' x 7' with a 1/2 open back wall to a same size dining room. I differsified with my room treatment, 8 different companies represented and counting.

I'm 57, single and I own a man cave!

Cheers,
Robin

[biz97]

Hey Mike,

  I actually have tried it.  The difference wasn't huge but I prefer the way the are.  Bryan actually recommended that I try it they way they are set (so that the fins would be perpendicular to the reflected sound).  FYI make sure you head to Lowe's/Home Depot to get extra firring if you plan to put them on the ceiling.  We put up 4 strips for each one on the ceiling so it is pretty easy to switch the D1 positions back and forth. 

**Edit**

For the ones behind me, Frank recommended that I mount them the way that they are now.  I just realized these are probably the ones you were asking about.

[Ethan Winer]

Realtraps has one that is optimized to be placed fairly close to the listener, so that's a good option too.

Just to clarify, we offer our diffusor in two models - Near and Far. Both are six inches thick total, and the Far model is best 6 feet away or farther. The Near type can be as close as 3 feet and offers more bass trapping.

--Ethan

[Glenn K]

Ya'know Mike, what you really need are a couple of GIK Table Taps om each end of them recliners.



Or maybe a couple GIK Elite Pillar Bass Traps for each corner to your loudspeakers. They could be used as plant stands for some silk plants if you don't have available lighting? Bass Traps would definitely unmuddy the bass,,, tighten it right up which in turn will help the whole frequency range. Works for me except I use a Real Traps Soffit Plant Stand but i do have the GIK Table Trap(s).


You might possibly want to treat the ceiling also. Looks like your ceiling is much higher than my 7' ceiling but a (very light) Furutech Diffusion Panel @ the 1st reflection point on my ceiling did wonders for my smallish room.


My 2 1/2 cents.
Cheers,
Robin

Just to clarify, the blond DOES NOT come with the pillar. 

Glenn

[bpape]

If the room allows, Jason (the D1 designer) also recommends placement on the side walls in the rear half of the room.

Ceiling reflection points also offer a nice improvement and a much more spacious feel.

Bryan

[srlaudio]

I echo the sentiment for putting diffusion on the ceiling points.  I would suggest a higher prime (wider) for more effectiveness.  I have had good luck with 6 and 8 ft wide units that are all one sequence.....

[mfsoa]

If I were to put two D1s on the ceiling 1st reflection point, would you guess that I'd want the ribs running F-B or S-S?
8' ceiling.

[srlaudio]

     The first reflection point may be to far ahead of you to make a difference, considering the small size of the units.  With the ribs running vertically, picture the diffusion patterns in a way that is similar to a line array speaker.  The vertical dispersion is generally 90 degrees straight off of the top and bottom.  The horizontal dispersion is much wider.  This is the plane of effectiveness on a Schroeder 2D design.  If the reflection point is ahead of the listening postition, they should be butted up end to end with the ribs running right to left.  If they were directly overhead of the listening position they should be side by side with the ribs running front to rear.  You are repeating a sequence in this mode, which is less effective than using one panel sequence with the whole or greater width.  I hope this helps with your decision, this is a distillation of a lot of information supported by the leading authorities in the field.