Room treatments - GIK Vs Acoustimac

Anyone have GIK Monster traps on the rear wall behind the listening position? , I'm about 6ft away and I have one on order !

Milpai

Please no on GIK
and triple no on Acoustimac - panels.

GIK large and bulky costly not so hot on acoustic waves
control...

Acoustimac NO NO NO ... heavy dirty-crumbly costly
and poor aucoustics.
We are very sorry we used these items.
Heavy to hold and tend to flake or crumble during
installation.

IN our Opinion
- - -

For home use please try out: foam products like;

http://www.acousticsfirst.com/sound-absorbers.htm

http://www.acousticsfirst.com/
acoustical-foam-cloudscape-ceiling-tiles.htm

The CLOUD foam tiles - neat as you will see...

Very pretty, easy to use, light weight, stylish
easy to control sound problems.

[we have NO interest in this company, except to their
products use in our audio projects.]

Let us know what you did...

Jdub39,
I have 2 of those behind me and I sit about 3 feet away. My room is small.

Cjl,
I have mentioned above that I went with GIK. They were pretty helpful and took a very conservative approach in getting my room treated. I have 2 tri-traps, 2 Monster panels and 2 244s in my room now. They are big panels. But I don't think humans are anywhere close to changing the laws of physics anytime soon.

Milpai,

The less you use to 'correct' the room reflections the better.

"...I want to get my system to a point where even when
I move my head from the center position, the vocals
should still appear to come from the middle.
Is this possible?

How should I decide between diffusion and absorption?..."

NEITHER !

Suggest you remove all your cross-overs circuits
from your speakers, change over to a non-crossover
circuit design.

The problem with room reflections is that the speakers are connected to the audio source with old-crossover circuits. The audio signal is changed at ever frequency, being phase distorted.
This 'phase-change' is noticed as a change in timbre of the vocals and in the unique sounds of instruments.

The acoustical energy should not need be focused to a sweet spot. A sweet spot is actually an indication of something not being done right.

And yes with the correct inter-face circuits you can
get away from the 'ideal spot' and end up with a much broader listening area; with vocals in their original 'positions' and instruments heard as never before!

The room's size becomes less of a problem due to correct
'phasing' of the audio signal(s).

Well let us start here...

I would NOT recommend ordering from Acoustimac.  They shipped me a partial order.  I have contacted them twice to ask them to ship the remainder of the order and have not received a response.  Disappointing customer experience.