Substantial posts by alierrett, who started the thread, and by the forum’s most active contributors. 45 of 108 posts are listed.
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alierrett, 13 September 2012Hi, my name is Alastair Errett and i’m a session drummer based in Derbyshire in the UK. I have a bedroom in my house on the second floor that I turned into a studio last…
Soundman2020, 14 September 2012Hi alierrett, and welcome! :) I'm wondering what the actual problem is: you mention a ringing around 500 to 600 Hz, so clearly this is not a modal issue: too high for…
Soundman2020, 15 September 2012Sorry about that, Reed! I didn't see your post before I replied: I had the tab open for many hours before getting back to it... :oops: Very possible. Those shelves are…
alierrett, 19 September 2012Hi guys thanks for you help so far, just need answers to a couple of questions. I don't have a large diaphragm condenser or know anyone that I could borrow one off.…
Soundman2020, 26 September 2012That's only if you want to calibrate REW so that it gives accurate absolute level readings. You do not need to do that if you just want to analyze the acoustics of the…
Soundman2020, 27 September 2012Ummmmm.... I think you missed the point! You will still need it! Just not for calibrating REW. You will need it for several things during your build, and for calibrating…
alierrett, 27 September 2012Haha, ok fair enough, I'll keep hold of it then. Just doing the acoustic analysis now so i'll upload that once it's done Update: Tried getting an analysis of my room…
Soundman2020, 27 September 2012Sell it and buy a REAL computer? :shock: :!: :lol: :lol: :roll: :yahoo: :shot: (OK, sorry: that was a cheap shot! ) Seriously, I'm not too clued up on Mac software,…
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alierrett, 20 November 2012Hi Guys, here is the sample of the drums within the room that Stuart asked for. I used an Shure SM81 positioned as shown in the diagram below with the mic pointing…
Soundman2020, 20 November 2012... thud ... BOOOOOM .... thud ... BOOOOOOM! :) OK, that pretty much confirms what was evident on the graphs: You have some major modal stuff going on there. And it…
Soundman2020, 20 November 2012Oops! :oops: :oops: OK, got it now. And it confirms the same issue, wonderfully. All three of your first axial modes are present and accounted for, at about 45 Hz, 59…
alierrett, 29 November 2012Ok so if i start off with a couple of Superchunks in the corners as wide as i can get for the two vertical corners and then all four horizontal corners wall-ceiling with…
alierrett, 29 November 2012Would it be a good idea if it's possible to remove the top part of the shelving unit (as shown below) and then do the two corners on the that side of the room and that…
alierrett, 4 December 2012Thanks Stuart that's great. For the walls would I need an air gap behind the insulation, for example 2" of insulation with a 2" gap. Or would it be better just to do 4"…
alierrett, 4 December 2012Ok thanks, how much of a gap should i go for at minimum? Also I edited the last post and so you probably missed the second question but does it matter if the corner…
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alierrett, 6 February 2013Hi guys, it's taken a while but i've finished the next draft of my studio design. If you guys could take a look and let me know what you think I would appreciate your…
Soundman2020, 6 February 2013Thant looks much better. A couple of questions: 1) What is the layer called "Covering" in your model? Is that some type of acoustic cloth? 2) What is the plan for the…
alierrett, 6 February 2013It's just a breathable fabric i've been using to cover my absorption material. The fabric i have been using until now is Calico. Is that ok? The entire ceiling currently…
Soundman2020, 7 February 2013OK, good. I wasn't sure, as it looks like drywall on the SketchUp model. Sounds great! Basically just a wooden frame with thick MDF, OSB or plywood on top, and some more…
alierrett, 8 February 2013Wow! 6mm, ok so we're talking more plastic boards rather than a thin layer of plastic film/wrap Ok, I can't hang it from the ceiling joists because of the insulation i…
Soundman2020, 8 February 2013Uhhh, no, not exactly!! I said "6 mil", not "6 millimeters". That's a rather different thing!!! :) A "mil" is 1/000th of an inch, so 6 mil is 0.006 inches, or 0.1524…
alierrett, 13 February 2013Haha ok, that makes more sense, I was a bit surprised that it would be that thick. Turns out it was me being a bit thick not the plastic :) Ok, i'll have to try and get…
Soundman2020, 13 February 2013Yes, I would do that: over time, some of the fine fibers in the insulation come lose an fall out, so they will slowly drift down and cover all your gear with this fine…
alierrett, 14 February 2013Hi Stuart, This is the most recent sketchup model with the cloud added. You can download it from here I went for an 11 degree angle on the cloud in the end which gives…
alierrett, 14 February 2013Presumably using acoustic caulk will be permanent though and will damage the floor and ceiling if removed later? I need the whole to treatment of my room to be fairly…
alierrett, 19 February 2013Ok, good idea, hadn't thought of that. Would I still need to use the acoustic caulk or will screw and glue be enough to attach the backing to the frame? This is the new…
Soundman2020, 21 February 2013That might work, but I would rather go with John's "standard" dimensions, that give you good broadband coverage. It's a proven design that works. Your slats seem a…
alierrett, 21 February 2013Sorry Stuart, I might be being a bit blind but I've looked around the forum and through John's Recording manual and can't seem to find the dimensions anywhere. Is this…
Soundman2020, 21 February 2013Those are the ones, yes. A slot wall acts more as an overall broadband absorber, with both reflection and diffusion, so it does a lot of things at once. Although you can…
alierrett, 21 February 2013Ok great, just one last question about the dimensions though. When it says "gaps from 6-12mm" what exactly is it suggesting? Pick one dimensions, say 6mm and use that…
Soundman2020, 22 February 2013The answer is: "Yes". :) :!: :shock: :roll: It really depends on what you are trying to accomplish. A slot wall is actually a complicated device that can do many things…
alierrett, 23 February 2013Thanks Stuart that's been really helpful. Having had a think about it the main problem is that I don't really know what I want to accomplish. I need to improve the low…
Soundman2020, 23 February 2013That's what I would do, for sure. All those wonderful prediction tools can give you results claiming to be accurate down to 0.1 Hz, and half a decibel, but reality is…
alierrett, 28 March 2013Hi, I'm currently trying to finalise all the details ready to start my build towards the end of April. I'm currently looking into what absorption material to go for. As…
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alierrett, 28 March 2013Thanks for the quick reply Stuart. I've managed to find a few other options with a lot of looking around. We don't seem to have too much choice here in the UK. However…
Soundman2020, 28 March 2013Yup! :) If that's the best stuff you have access to, then that is what you should use. Theoretically, you could test the acoustic response of your room (with REW), and…
alierrett, 10 April 2013Hi Stuart, i'm just look at the construction of my cloud and looking back through the posts i'm wondering why we went for 2" of insulation above and the hard back and 2"…
alierrett, 22 April 2013I just received all the materials over the weekend so i'm now ready to start my build. I'm going to make the cloud first so that I can work out how much it'll weigh and…
Soundman2020, 2 June 2013Those are the points where the sound emitted by the speakers bounces off a surface and gets directly to your ears. Usually on the side walls and on the ceiling above the…
Soundman2020, 13 June 2013I'm very confused by that latest REW file: The "soundcard calibration" curve is unreal! Unbelievable. And the SPL curves are nothing at all like the ones you posted…
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Soundman2020, 9 July 2013Hey, Alistair, sorry about that! Missed the update... Well, the latest graph certainly shows a major improvement in that huge mode that you had at around 40 Hz, and a…
alierrett, 9 July 2013I would be very interested in fixing them if I can. The reason the original and finished curves do not match are because they are using to different interfaces. The…
Soundman2020, 11 July 2013Tat should not make any difference at all: you did the calibration for both of them, and both the calibration files are in use, so any difference between the interfaces…
alierrett, 12 July 2013Ah ok I understand now. However there are several different REW files one of which has a different mic position to the other two tests. To make sure we're looking at the…
Soundman2020, 20 August 2013Well, there sure is a major improvement evident in that final REW test, as compared to the original! The biggest remaining issue is the ringing at 90 Hz. That is…