Milgard Quiet Line Windows

I found these while surfing the web. I think they have decent STC rating (between 40-47). Check them out and let me know what your thoughts are. I might consider installing one of these between my CR and vocals booth. I really don't need complete isolation so, I guess STC of 47 would be good enough. http://www.milgard.com/products/sound-c ... icture.asp

Laptoppop used those, here are his comments - http://www.johnlsayers.com/phpBB2/viewt ... c&start=15 HTH... Steve

That's awesome! now atleast I know they work well. I called one of the dealers, it takes about 6 weeks for delivery :(

Here is a document I found that shows how the windows are constructed: http://www.acousticalsolutions.com/prod ... icture.pdf

Yeah, I know - that's part of why I didn't think these would work very well at lower frequencies - I noticed they are very careful to ONLY use STC, and not give actual TL values at different frequencies - even though these are rated at STC 46 or so, they wouldn't perform as well at lower frequencies as the same system with two single panes, making a true mass-air-mass barrier - if you put two panes of single glass in a window with 90mm space between, using 6mm glass on one side and 9mm on the other, you also end up with STC 46 - the difference is, instead of your TL dropping to about 18 or 19 at 50 hZ, it's up around 25-26 dB. That triple leaf thing just isn't as efficient at lower frequencies, and can't be. OTOH, Lee's happy with his - I can't help wondering how much more he'd like them if they had one pane of thicker glass instead of that insulated pane... Steve

My guess would be that you are not going to be happy with these for control room windows. A window used to isolate the outside world is a different animal than that used for your control room. Although you may get your STC 45 - you are going to get very little in the low frequencies. So if your bass and drums (Toms and Bass) are combined at somewhere around 95to 100 db....... the 80 to 85 db (rough estimate) you hear in your control room is going to sound pretty loud. Personally I would save my money and do it the conventional way. It's got to be a whole lot cheaper with better results for the same s.f. of window area. Rod

Thanks Rod and Steve! I have finally decided to do it the conventional way :D I ordered two pieces of glass (1/4" and 3/8") and will be building the window on my own. I am still debating if I should angle the panes or not. I'll see how it goes ...

What's your total available air gap between panes, if they're NOT angled? (BTW, I think you're making the right choice staying away from multi-leaf here) Steve

My guess is about 7" with 1/2" neoprene or 7.5" with 1/4" neoprene. I may be able to get more air gap if I make the two wall frames with an inch of over hang on each side of the wall opening. What size of neoprene should I get?

I wouldn't splay the glasses unless glare from lights or early reflections back to the mix position will be affected - and look for a source of EPDM rubber, NOT neoprene - the difference is about 10 year life vs. 25 years. - 1/4" is good for windows - too thick and you may actually amplify instead of decouple the glasses... Steve

Is it available as a roll like neoprene? I did a quick search on google and found 12"x12" sheets. I am planning to install one glass pane at right angle first, then I'll look through the second glass to see if there are any glare issues ... hopefully it's as easy to do as talking about it :)

Here's the only two links I have - on the second one, you can glue two layers of 1/8" if necessary - http://www.rubbercal.com/epdm.html http://www.materialscraps.com/Merchant2 ... _Code=EPDM These products are handled the same as neoprene, it's just that the EPDM holds up about 2-1/2 times as long... Steve