Substantial posts by almaelectronix, who started the thread, and by the forum’s most active contributors. 77 of 120 posts are listed.
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almaelectronix, 11 July 2018Hi everyone, I am George. Thank you for the time and the effort you all put into this forum! I am reading the forum for some time now, also reading Rod Gervais book and…
Soundman2020, 12 July 2018Hi George, and Welcome! :) 41 m2 is certainly a nice size for a control room. I'm not familiar with those, personally, but I've read good things about them. They don't…
almaelectronix, 12 July 2018Thank you Stuart, thanks for taking the time to reply and really quick! These 2-way monitors with SL bass/mid drivers are nicer looking :D , slightly larger and more…
almaelectronix, 12 July 2018Hi Gregwor, thank you for your post! I don't really know how to design any of these, I guess I will try to create a reflection free zone at the listening position but I…
Soundman2020, 12 July 2018Great! But there's a problem with the way you are doing your tests. Take a look at this: Image not preserved: ALMAELECTRONIX-all-levels-the-same.png Notice something…
almaelectronix, 13 July 2018Stuart thank you! You are right as always! I searched my notebook and guess what..it seems that for some reason I decreased the laptop output volume for measuring both…
almaelectronix, 17 July 2018So I am posting some of the "grey" areas of my thoughts and maybe someone wants to share his thoughts about them.. In my room I 've got ceiling's concrete joists which…
almaelectronix, 21 July 2018I measured the room as of now , with all the corner traps in place. I can see that they do have some effect after all. :D Image not preserved: spect.jpg Image not…
almaelectronix, 22 July 2018So I am planning of making the back wall 60cm deep and going up to 1m deep on the corners. I will leave the mineral wool rolls in place and add the hangers in front of…
Soundman2020, 23 July 2018I would not do that. It limits the size of your hangers in the corners, which are the most important ones of all. If that were my room, I would remove those "tubes" and…
almaelectronix, 23 July 2018OC-703 has a GFR of 16Kpas/m2 in published documents and 24Kpas/m2 measured by Nasa. Do you know which one is true? That said, I can use either rockwool of GFR 15kpas/m3…
almaelectronix, 25 July 2018So I decided to change the angle of the hangers as I move closer to the corner. Starting from 25 degrees on the middle of the back wall and having the last hanger…
Soundman2020, 25 July 2018That's fine. No problem. However, I'd suggest starting with a larger angle, more like 40°, so the hangers in the middle of the room can still be decently wide. I would…
almaelectronix, 27 July 2018I designed the hangers plan on 10:1 scale and I finally came up with this: Image not preserved: working hangs.jpg This one will probably work better than the other plans…
almaelectronix, 27 July 2018Ok, then, I will do the middle option :D There was a mistake on air gaps so I rearranged the middle plan a bit. I added one more flat hanger on corner and one small…
almaelectronix, 22 August 2018Hi all! There is some progress in my room. I started converting the front vertical corners, from the corner insulation rolls I previously had, to superchunk style bass…
almaelectronix, 25 August 2018insulation added! knauf ecose for the triangles, 1m long are the sides of the triangles, 1.4m long is the face, about 75cm deep, GFR of 5kpas/m2. Right in front of the…
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almaelectronix, 28 August 2018Started the backwall hangers project. But before getting there I had a lot of things to take care of.. I removed the old and installed the new soundproofing door on the…
almaelectronix, 28 August 2018Image not preserved: 20180801_125223-700x933.jpg Image not preserved: 20180801_141407-700x933.jpg Image not preserved: 20180801_141411-700x933.jpg Image not preserved:…
almaelectronix, 3 September 2018Before proceeding with the "back wall hangers" project, I had to construct a box to isolate the ventilation from the rest. This way I can attach the soundproofing boxes…
almaelectronix, 21 September 2018I can read on the forum that the silencer boxes for the ventilation need to be at least 2X bigger than the duct for lowering the static pressure and keep the velocity…
Gregwor, 21 September 2018It does more than lower the static pressure and keep the velocity low. It actually creates an impedance mismatch which helps to attenuate low frequencies by reflecting…
almaelectronix, 21 September 2018Hi Greg, thank you for your reply, it is much of help for me since I read a ton of posts about hvac and I got confused at some point. I thought that it is the baffles…
Gregwor, 21 September 2018I don't think it's enough. I'd use two layers of 5/8" minimum! For the silencers, should use a thickness that will be equivalent to the two layers of 5/8" drywall. I…
almaelectronix, 21 September 2018I will do that! Ok I will frame the paths with OSB as you suggest. Yes I remember something like 1.5m maximum length for flex duct. To be honest the one I used is…
Gregwor, 21 September 2018Okay, you need to sit down and figure this stuff out. It's very important. I can't remember what your HVAC system consists of -- what are you using for heating, cooling,…
almaelectronix, 22 September 2018I will use a split a/c unit for heating and cooling. The ventilation will be separated from the a/c. I will try to find the spreadsheets, if by any chance you have a…
almaelectronix, 22 September 2018Ok I found some spreadsheets over the net for calculating the static pressure etc. It really seems impossible for me to do the calculations, I don't even know where to…
Gregwor, 22 September 2018:thu: So your ventilation ducts only need to provide you with 25-30% of your required CFM provided by your split unit. Have you calculated your required CFM yet? What…
almaelectronix, 22 September 2018Why? My a/c split unit doesnt provide air from the outside to the inside of the room, it just uses the existing air and heats or cool it. I dont know if there are many…
Gregwor, 23 September 2018I'm suggesting that you can calculate the amount of CFM your fan needs to supply. And from that, you can calculate your other needs (like duct size and velocity). :D And…
almaelectronix, 23 September 2018Yes I got that and I 've seen the number 25-30% again but I can't understand it.. I thought my fan had to supply 100% of the CFM since the a/c unit is not supplying any…
Gregwor, 24 September 2018In a normal home, the furnace moves the full required/calculated CFM. For example, say a home needs 2000 CFM. In the winter, the furnace isn't going to dump 2000 CFM out…
almaelectronix, 24 September 2018That pretty much clears it up, thank you! Yeah they will be like 8 meters apart from each other, the exhaust register will be near the front wall and close to the…
almaelectronix, 1 November 2018Some progress on back wall. Back wall, sides and ceiling are lined with insulation, floor will be next after placing the hangers. Doubled the drywall sheets for the HVAC…
almaelectronix, 2 May 2019So my plan for the hanger was originally this: Image not preserved: Untitled-1d 2.jpg That's because I couldn't find less thick insulation, but I did. So as Stuart…
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almaelectronix, 5 May 2019So hanger's plan changed. That's the new one: Image not preserved: hangers fiberglass clean 2.jpg I will now have 43 hangers instead of 34 with the previous plan. And…
almaelectronix, 15 May 2019Hi all! I read that a good ISD gap for an RFZ room falls between 20ms to 30ms with the ideal being towards 25-30ms. I am trying to find information how to handle longer…
almaelectronix, 17 May 2019Good to know that I am on the right track! Thanks Greg Today I figured out that in addition to the central 90x90cm skyline diffuser I can add more diffusers in variable…
almaelectronix, 7 July 2019Jumping back..about the front superchunks.. Do you see any advantage of adding a rockwool face layer of 1-2cm, 75kg density (49K.Pas/m2) ? I am using porous calculator…
almaelectronix, 10 July 2019Thank you Stuart, I think I 'll take your word that its fine without the face layer because right now I am in the middle of building the hangers on back wall and I have…
almaelectronix, 11 August 2019Posting some photos of my progress so far. I've built the ventilation's silencer boxes using 15mm OSB, lined inside with 50mm insulation. Four of them, two for each air…
almaelectronix, 11 August 2019And some more on a second post cause they were too much fitting on my previous post. Just the outside on this: Image not preserved: sf_20190811_150303_002.jpg Image not…
almaelectronix, 17 October 2019Not at all! I am satisfied as I tried higher than my normal mixing levels and still is good, no sound getting in or out. I guess the 2 boxes inside, 2 outside and making…
almaelectronix, 1 November 2019Will do!!!! I am still working the hangers project on the back wall, I will post some photos as soon as I finish. I just got the homasote boards and the insulation, the…
almaelectronix, 17 November 2019That's the soft board I am using for the hanger's core. Image not preserved: 20191117_120230-600x600.jpg Image not preserved: 20191117_120239-600x600.jpg The density is…
almaelectronix, 25 January 2020Hi!!! Posting more photos of my progress so far! Here's my DIY 1D QRD: Image not preserved: 20200125_231235_resize_27.jpg Image not preserved:…
almaelectronix, 29 January 2020Yeap 3.6 meters high monsters! I would love too! Hang on there sir, I have to get rid a mountain of things sitting right in the middle of the room covered with a plastic…
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almaelectronix, 4 February 2020Not really, do you think it would be beneficial to do so? I mean my design works now for the low and high frequency cutoff of my room so what it is that would change if…
almaelectronix, 8 February 2020Hi Greg and thanks for your time! :) J.H.Brandt has a spreadsheet available for all on his site which calculates these along with many other things. He also describes…
almaelectronix, 23 April 2020Photo updates of my place. Steel framing for housing the face insulation: Image not preserved: 1.jpg Framing and covering with LPDE (for insulation's dust free use) of…
almaelectronix, 23 April 2020photo update part 2. Finishing inner door's cavity: Image not preserved: 16.jpg Image not preserved: 17.jpg Image not preserved: 18.jpg Image not preserved: 19.jpg…
almaelectronix, 23 April 2020Attaching the measurements for the room as of now. Frequency responce got a lot better. Rt also getting close to 267ms target with the low end being partly there. ETC…
almaelectronix, 24 April 2020Ray traced the hard back clouds. 25° angle for the front, 9° for middle and back seem to work in favor Nice having 4 meters high ceilings, some limitations due to…
almaelectronix, 25 April 2020Wondering if it's better to add 5cm insulation 50kg/m3 (gfr=30kpas/m2) on cloud instead of 10cm 40kg/m3 (gfr=15kpas/m2), given that the RT is looking good on low end and…
almaelectronix, 26 April 2020The front cloud will be tilted down 80-90cm so I think I can extend the front horizontal upper corner trap by adding more insulation under the one I already have. I…
almaelectronix, 5 May 2020Hey Greg, thank you for your kind words! yes I am pleased with the progress! And the hanger door turned out great! The hangers can even move freely but without getting…
almaelectronix, 24 May 2020Some progress on front wall to ceiling horizontal corner trap. Image not preserved: Screenshot_20200524-174314_Instagram_resize_5.jpg Image not preserved:…
almaelectronix, 6 August 2020Making the Steel frames for the clouds: Image not preserved: Screenshot_20200806-180756_Instagram_resize_25.jpg Image not preserved:…
almaelectronix, 6 August 2020But before hanging the clouds I needed to make the frames for the wall to ceiling corner traps so that the fabric can "sit" on and take a shape. Image not preserved:…
almaelectronix, 6 August 2020Hanging the clouds! On these guys: Image not preserved: 16.jpg Front cloud, above listening position: Image not preserved: 17.jpg Image not preserved: 18.jpg Image not…
almaelectronix, 6 August 2020Adding the insulation. Custom spacers for attaching the insulation's frame: Image not preserved: 30.jpg Image not preserved: 31.jpg Image not preserved: 32.jpg Front:…
almaelectronix, 7 August 2020Yes, and I am doing this by myself... Thank you! I am so and so because I see I have still lot of problems to deal with so.. The weight for the hardback alone is 80Kg.…
almaelectronix, 21 August 2020Any ideas how to tame this 1-0-0 axial mode? I've got close to 1" decay time at 18.2Hz... Measurements attached Image not preserved: llrr.jpg It affects the sub low…
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almaelectronix, 26 August 2020Should I consider measurements' ringing or the dimensions' modes for building my traps? According to room's dimensions the lower axial modes are: 1 19.71 Hz D0# 1-0-0 ax…
Paulus87, 26 August 2020Porous absorbers can have an effect on membranes, so I would treat the ringing according to your measurements rather than your predicted room modes. I have to say…
almaelectronix, 26 August 2020Hi Paul and thank you for your input , I really appreciate! I further studied the LMA's and read today what the designer says: "These traps are intended to tame room…
almaelectronix, 24 December 2020Hi all! Merry Christmas and Happy new Year! My best wishes for all people! Some progress from my room. Finished the front wall LMA's and insulation. Here are the pics…
almaelectronix, 8 January 2021I had to make better use of the only space available on the back wall in order to tame the low axial room mode. So I said goodbye to my hard built diffuser and 2 LMA's…
gullfo, 8 January 2021definitely an improvement! nice work overall! yeah, tuned treatment typically aren't very large compared to the wavelengths involved since their concept is to resonate…
almaelectronix, 18 June 2021So change of plans.. Ceiling clouds and corner traps (bin bags) removed. Will make the whole ceiling absorptive and hide the HVAC exhaust air path inside the false…
almaelectronix, 18 June 2021And front part of the ceiling, rebuilding this front wall to ceiling corner trap. Image not preserved: 15.jpg Image not preserved: 16.jpg Image not preserved: 17.jpg…
almaelectronix, 18 June 2021Fixing walls!!! Removed the old paint, 2 layers of plastering, 3 times sanding, 2 coats of primer, 3 coats of paint. Image not preserved: 30a.jpg Image not preserved:…
almaelectronix, 27 June 2021Hi Scott, thank you very much! Hehe yeah it sure does though it's 4 meters (13feet). It's cool for its properties and the fewer problems that introduces. But it's been a…
almaelectronix, 20 November 2021Side walls polys for flutter echo and hiding the ugly beams: Image not preserved: prog (1).jpg Image not preserved: prog (2).jpg Image not preserved: prog (3).jpg Image…
almaelectronix, 20 November 2021last of the side wall polys and boards: Image not preserved: prog (17).jpg Image not preserved: prog (18).jpg Image not preserved: prog (19).jpg particles protection and…
almaelectronix, 20 November 2021Ceiling's fabric, wooden details, hvac registers, lights: Image not preserved: prog (34).jpg Image not preserved: prog (35).jpg Image not preserved: prog (36).jpg Image…