Substantial posts by andihopkins, who started the thread, and by the forum’s most active contributors. 43 of 66 posts are listed.
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andihopkins, 31 December 2008Hey guys, I'm living at the foothills of Perth, Western Australia, and I'm currently making plans for a control room. I'm going for a 2-shell design, based on F. Alton…
Soundman2020, 31 December 2008Hi Andy, Here are some comments on your updated post. Please don't take them the wrong way: they are intended to be constructive criticism. Most people here build the…
andihopkins, 31 December 2008Hi Stuart, Thanks for taking the time to reply to my post. It's strange that you mention The Master Handbook of Acoustics... as this is one of the books from which I…
andihopkins, 31 December 2008Also, could I ask, where does MAM / MSM come from? Is that one of Gervais'? I'm interested in doing some more research on it, but can't find much about it in any of my…
Soundman2020, 31 December 2008The concept has been around for decades, and is widely used in acoustic isolation. I'm surprised none of your books mention it! It's not exactly a new concept. Rod is…
andihopkins, 31 December 2008Cheers for the info Stuart. Just did a quick search through, and I could only find MSM / MAM in the Glossary of one book, Carl Hopkins' Sound Insulation. But he only…
xSpace, 1 January 2009Hi andihopkins, Happy New Year! What a lot of people in your side of the world use is metal or wood framing and sheet rock for the interior leaf/wall for thier build. I…
rod gervais, 15 January 2009Andy, I wonder, seeing as you don't mention either reading (or owning) my book - how it is that some of my art-work ended up in your paper? Some of what I see in there…
rod gervais, 15 January 2009Andy, To begin - I do not invent construction terminology.......... Not surprising - no one book can cover everything about the field....... Extensive studies on this…
andihopkins, 16 January 2009Hi Rod, Thanks for taking the time to reply, appreciate it. From what I know now, the MSM system is exactly the same as F. Alton Everest's '2-shell' system, and Philip…
andihopkins, 16 January 2009No worries Rod. One of the students in my class at SAE has your book, I had a bit of a flick through (not what I would call I formal read) as we are currently in the…
rod gervais, 16 January 2009I did not coin the phrase - and do not know who did - however it relates quite simply to 2 layers wraping an inner air layer that creates a spring. [/quote] I am hoping…
rod gervais, 16 January 2009Andy, I have no issue about the use - however I do have an issue about (and not of mine in particular) the copying of ANYTHING from a source without naming the source.…
andihopkins, 16 January 2009Ok, here are the page/chapter details in MHoA: Page 442 - Chapter 21 Just above the title, 'Outer Shell of the Control Room' he says... He then goes on to talk about the…
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andihopkins, 16 January 2009Rod, As I pointed out in a few sentences before the link to the pdf. - the link is a seriously drafty draft, and I have changed an incredible amount since I posted that.…
rod gervais, 16 January 2009OK - this is tough - we are discussing the same thing in 2 different threads...... so after this - let's try to consolidatethis into one location - this from the other…
andihopkins, 16 January 2009Thanks for the info Rod. Two quick things before I continue: 1. Thank you for taking the time to help. I really appreciate it. 2. I will not be embarrassed if I truly…
andihopkins, 16 January 2009To put my questions into a practical application, here is an example of my perspective, as to how isolation and bass trapping may be able to be treated using a 2-shell…
rod gervais, 16 January 2009Andy, Understand a couple of things here...... first off - Everest was not writing a primer for the uninitiated to learn the basics from - he was writing an engineering…
andihopkins, 16 January 2009Rod, The thing that is most frustrating about all this, is that it seems no one has explained to me the big picture. (unless of course I have missed it) We seem to be…
rod gervais, 16 January 2009Ah - but the hangers are not inside the spring of the system........ they are inside of the control room. Installing a false ceiling does not necessarily create the…
andihopkins, 17 January 2009Rod, I am confused. Wouldn't this create a 3-leaf system? An additional false wall, in front of the MSM system, would create another leaf? Is that correct? Therefore, I…
rod gervais, 17 January 2009Andy, typically I use a full frame assembly with my treatments inside the space plus rigid fiberglass at the face - and then cover the entire assembly with fabric. more…
andihopkins, 17 January 2009Ok, that makes sense. I think I'm starting to understand the differences. One thing that I am still a little confused about however, is what dimension is now determining…
rod gervais, 17 January 2009Andy, Please visit the IRC site I placed the link to and examine the document for wood and steel framed walls......... Even the most simple wall - 2x4's @ 16" centers…
rod gervais, 17 January 2009Andy, In all fairness - when I find someone as insistent as you have been - I go hunting...... I did locate a study by the BBC where they experimented with room…
andihopkins, 18 January 2009Rod, I'm wondering... what if you wanted to employ a Controlled Image Design? Whereby the false walls act to redirect early reflections away from mix position, creating…
andihopkins, 19 January 2009OK, i see.. The image below... is that still an MSM system? Even with such variation in distance between the 1st and 2nd mass throughout the room. Wouldn't that result…
andihopkins, 20 January 2009No, no Stuart. I have gotten past the understanding that the leafs must be air tight... a slotted leaf wouldn't work. My idea was, if you used your design for a false…
Soundman2020, 20 January 2009OK, Andy, it looks like I misunderstood you there! My bad. To me, it looks like you are trying to combine a slot resonator with a bass trap? The basic concept of "slots…
andihopkins, 20 January 2009Hi Stuart, Thanks the reply. And my apologies for our heated argument in the other post... I haven't had much sleep lately! Doesn't this combination create a Membrane…
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Soundman2020, 20 January 2009Apology accepted! No problem. Glad to see that you are back in learning mode now! (Like me!) Yes, but his "wall" is just a piece of acoustic cloth stretch across a…
andihopkins, 21 January 2009Are you referring to the acoustic hangers... or the slotted false wall? I can't remember me saying that the acoustic hangers were tuned. The concept is similar to a…
Soundman2020, 21 January 2009Those are not "false, slotted walls"! They are the inner leaf of a MAM system, just like you suggested when you first posted that image. If you wanted to install false…
andihopkins, 21 January 2009Yes. They are. I posted the image again ONLY to illustrate the intended CID. NOT to show the entire design of the room. Fine. I'll call it a slotted wall then... if that…
Soundman2020, 22 January 2009Actually, it absolutely DOES matter what you call it! That seems to be a big part of your troubles here: you keep referring to the same things with different names,…
andihopkins, 22 January 2009There seems to be too much of a communication barrier between us, Stuart. Thus, I think it may be better to just place this thread in the cupboard. We don't understand…
andihopkins, 22 January 2009Stuart, A final thought... From the information I have read, I don't think you can use the light analogy for all frequencies. This can apply mainly to high frequencies,…
Soundman2020, 24 January 2009Andy, in all sincerity, the communication problem doesn't come from my side. Communication is what I do for a living, most of the time. I think I've explained things…
andihopkins, 25 January 2009Confusion? What confusion? I am only going by what I have read in books far more highly esteemed, than your opinions. Well, you try and tell that to F. Alton Everest, or…
Soundman2020, 25 January 2009There certainly is truth in the old saying: "You can lead a horse to water, but you cannot make it drink". I'm not quite sure how you managed to get electromagnetic…
andihopkins, 25 January 2009HAHA! Three posts ago you were relating acoustics to light... which ARE visible electromagnetic waves. Hence, another reason why I don't listen to you... I was using it…
andihopkins, 8 February 2009Hey guys, Have been reading through MHoA again.. and found a very interesting sentence. Master Handbook of Acoustics, Chapter: Absorption of Sound, Page: 205 Now Rod has…