[terry j]

Originally Posted by DanDan

I would love to test them, but the woodworking is beyond me.

You can do some tho can't you dan?? It is pretty easy, hopefully easy enough that my pics can show you how. Fingers crossed eh?

I am waiting for some tests from Gavin at Auralex. I have an article here which describes how the author (designer?) Jeff Syzmanksi, reckons they work. To me, it is all hypothetically plausible. However the increase of LF absorption of 40% in the 125 Octave band really caught my attention. If this is true, plus the promised 'liveness' this is truly a device worthy of experimentation. Hopefully Terry will show us that.

You mentioned in that other thread about 'pm for details', is there anything you need to let me know privately rather than publicly before I start?? You'd agree that if we want a good valid trial, we had better get it right construction wise.

Terry, I would rather see FuzzMeasure, 3 in particular used. However, assuming I will assume REW and get to know it a bit better in order to help you-
Mark your measurement spots on the floor with tape. Tie some thread and a weight to your measurement mic. This will ensure that the mic measures in exactly the same spot before and after the introduction of the Couplers. Drive the room well by putting the speakers in the corners, on the floor, if possible. We are interested in modal decay here not frequency response. The more Couplers and Traps involved, the more meaningful the test. Four corners floor to ceiling would be ideal.
I very strongly encourage your efforts here. I have a good feeling about this.
40% more LF action. Better looking. Some HF diffusion/liveness.
A lot to like!
DD

Looks like we are starting to hit the first of our problems or compromises. Fuzzmeasure, is that mainly used for mac guys???? Anyway, will stick with REW as I know it and have no need to learn another program. It does not have to be you I e-mail the file to (heck I guess I don't need to mail it to anyone-just that it might be easier and quicker is all) it can be anyone who knows more than I do (ie read everyone!!).

The more Couplers and Traps involved, the more meaningful the test. Four corners floor to ceiling would be ideal. Ok, is this a problem. Unfortunately what I will not be able to do is 'four corners normal trapped, vs four corners space coupled.' The coupler will be built into the traps, not an add on that can be taken off and put on at will (like it is in the photo earlier by Jeffery, it is clearly hanging in front of existing traps).

As I have already built some traps now, I CAN measure them as is, keep exactly the same f/glass and re-measure with the coupler (as I will be building new frames).

Conceivably I could do each succeeding trap likewise, but could not do four final traps with/without the coupler.

(hope that made sense, it's just the way and the order in which these will be built that I am trying to explain)

Tie some thread and a weight to your measurement mic. I can do that, but in the bass region here is that degree of repeatabilty and accuracy required???

Drive the room well by putting the speakers in the corners, on the floor, if possible. Ok, not going to move my speakers at all. If however you can convince me that this is needed, what I can do is haul out some subs (two subs each with four tens enough??) and lug them into a corner and leave it there. Bit of a hassle, but if needed then we may as well do it. (no point in doing it half arsed really) EDIT it would be much quicker and easier for me to simply use my mains where they are. Your call tho, let me know and I will obey!

Here is the current layout so you can see if it's acceptable to do the measurements with the layout as is



The red is the current layout, the space I am currently filling with the traps is marked beside the fireplace

Last thing from your post, as this is so we all can learn, can you amplify/explain more this line?

We are interested in modal decay here not frequency response. Can you seperate the two for me and tell us what we will be looking for?

Does this influence where you want me to put the mic for example?? (ie you want me to place the sub in a certain spot, do you want me to put the mic in a certain spot?)

Originally Posted by Jeffrey Hedback

In regard to the Auralex SpaceCoupler it is 3/8" Paulonia wood which is an instrument grade wood. I do think the wood itself has bearing on it's overall effectiveness.

Arrggghhh I got off audiophile forums for this sort of reason!! hahahah...was sick of discussion about how important it was to have your equipment rack built out of the right wood...for SONIC reasons (yeah, serious. Evidently the bees knees is canadian rock maple..arrggghhh)

Only having a bit of fun jeffery, but using a certain type of wood in things like this is just marketing rubbish surely. My only surprise is that it was used in a pro context, that's all.

Originally Posted by Jeffrey Hedback

In use, I've had most success at mid-wall axial pressure points compared to corner assemblies.

Typical aint it!! Mine are going into the corners.