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Serge wrote:

Wouldn't you want to try some HF diffusing stuff on your back wall windows? Like wooden plank blinds if you see what I mean? Or you want the reflections to be catched earlier, behind the listening couch?

Nope, it will be no HF diffusing on your back wall windows; at least I am not planning to do it now. I have different idea. In fact I had this ide from the very first time what I saw the room during the open house. I do not have a newest picture, use the old one:

If you look at the picture then you see power entry port in the carpet in the middle of the room, between the pile of carpenter shit under cloth and the brash. This power entry is presumed listening position. So, what is behind, what would constitute a back wall? The vertical column in near mid of the room, which is 22”, and the ridge under the horns. The rest space is wide open and reflections form this wide open spaces are high but they are very far and very low in amplitude. So, whatever is left from the back wall – horizontal ridge, middle vertical column and those two narrow side vertical columns will be covered with 2” pyramid white melamine foam. The 2” is not too deadly foam acoustically and not too extended in the room. It looks also not so bad that is important to me. I am convinced that the amount “treated” surface on the back wall in proportion to wide open untreated space will do fine and will not over damp the back wall.  It will be 4-6 “islands” however on the ridge made from 6” foam, I will use them to will break the monotonous reflective patter of the 2” pyramid. I have bought everything already and it sitting in the next room, waiting to be used. What I palace all of it on wall wall I will make a picture that will show what I meant to do. Also, as I put the things to the walls I will be listening and will be able see how it goes.

To my big surprise, the biggest in subject to me in room treatment now is not the room treatment itself but finalizing the exact location of listening chair.  It feels like a large room and the chair might slide a good 8 feet closer and further from the speakers. In reality however it will be just ONE very virtually bolted location for my chair. To finalize the deadly location for listening chair is a bit tricky but everything I will do with playback will start ONLY AFTER this location is found. The right location would imply the Macondo upperbass and upper channel arrival calibration, midbass arrival and ULF arrival. Remind you that time alignment is a subject of crossover order, each order is ~ 2.5’ at 100Hz. So, I need to get precisely how my channels are operating, have them properly calibrated and then to find the only proper arrival equidistant position. Do not forget then in my room the MF, upperbass and lower bass will arrive from 3 different directions – front, back, and above. So, the location of my listening chair will be VERY important in order to make everything to work as I would like it to work.  My current experiments, to me displeasure, suggest that the listening chair will be much closer to the back way then I initially thought. Still, this is not final location and I am working on this subject now.

Unicon, I did research the topic of the tube traps and I will make them myself. Partially it is money and partially because I would like them to be exactly as I wanted them to be. I have a local company:

http://www.generalinsulation.com/

…a few towns over in Malden the sell the compress fiberglass tubes, $3-$4 per foot.

The fabric to cover the tube is not a big deal at all.

http://www.fabricmatestore.com/p-9-fr701-panel-fabric.aspx

Even if I do not do it myself (that shall be very easy) and recruit my carpenter to do it for me then I will be hugely less expensive but I will have the tubes exactly as I want them to be. I do need some middle of the room absorbers and HF stoppers. I would like to use the room with my glass door’s shades wide opened but during the cold times I will not be able to open the glass doors. To listen with glass is imposable, so I need to fun some kind of treatment that would allow me to have glass door closed but with the blinds. BTW, the women who sold me the house told me that during the winter the conservation land behind my glass doors will be endless white file with hills, sort of a Vermont landscape.  I can’t wait to see it, to fire my fireplace and play the second movement from Rachmaninoff’s Second Concerto….

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