C.R Double Windows - still confuse

[sevenways]

I will make 8mm and 10mm of two glasses and overall window size is 2'x3'.
And 8" gap at up and 6" gap at bottom between them. But I can make more gap there.

My questions are,

If I angle both glass, do they have to same in angle degree?
And is there any pic about 'insulation' between them? I know it's fabric cover fibreglass, but don't know how to do.

ohh sorry for my English

 

[bpape]

The panes to not have to be angled at the same dimension. Normally, one would just angle one of the panes.

As for insulation, there isn't any between the glass. It's all in the walls. The 2 pane setup should be caulked air tight and the structure should maintain phyisical isolation between the 2 halves of the wall.

Bryan

 

[sevenways]

Thanks Bryan

 

[vbass]

I second Bryan's answer, just angle one pane. The one I constructed in my studio had a gap of about 6" at the bottom and 4" at the top. I'm quite happy with it. Posting some construction shots.

 

[pandamonk]

I'd suggest not angling any, for best isolation. If isolation is not a huge problem, then angle away. And, your English is decent. Probably better than mine.

 

[bpape]

Why would having a fixed distance between panes where the resonance is all at one frequency be better for iso than spreading the resonance between panes with one being angled?

The angled pane also offers one less parallel surface from that glass to the wall that's likely parallel on the other side of the room.

Bryan

 

[knightfly]

Bryan - from Richard Schrag of Russ Berger Design Group

http://www.audio-muziek.nl/audiotechniek/acoustics.pdf

Check out "myth # 3... Steve

 

[Rod Gervais]

Why would having a fixed distance between panes where the resonance is all at one frequency be better for iso than spreading the resonance between panes with one being angled?

The angled pane also offers one less parallel surface from that glass to the wall that's likely parallel on the other side of the room.

Bryan,

Because the maximum isolation is equal to the maximum spring - wihich (in this case) is with the 2 glass panels parallel to one another.

BTW - the reasonance between the panes should not be "all at one frequency " if the glass is (as is noted with the original poster) different thicknesses.

The single best reason to angle the glass is that it looks kewl that way - the 2nd best is to avoid visual reflections, which is easier to do with angled panels than with lighting.

Sincerely,

Rod

 

[sevenways]

Thanks for the all advice
I will angle one pane to prevent light reflections.
But which room should has angle side? Control room or tracking room?

My both rooms are all made with parallel walls. So Can angle-panes decrease standing wave between room's front wall and rear wall?

Thanks,
Linn

 

[pandamonk]

Bryan,

Because the maximum isolation is equal to the maximum spring - wihich (in this case) is with the 2 glass panels parallel to one another.

BTW - the reasonance between the panes should not be "all at one frequency " if the glass is (as is noted with the original poster) different thicknesses.

The single best reason to angle the glass is that it looks kewl that way - the 2nd best is to avoid visual reflections, which is easier to do with angled panels than with lighting.

Sincerely,

Rod

Thanks Rod, and Steve. Said it much better than i ever could

 

[pandamonk]

The angled pane also offers one less parallel surface from that glass to the wall that's likely parallel on the other side of the room.

Bryan

This is true, but generally, in a control room at least, shouldn't it be symmetrical?

 

[pandamonk]

Thanks for the all advice
I will angle one pane to prevent light reflections.
But which room should has angle side? Control room or tracking room?

My both rooms are all made with parallel walls. So Can angle-panes decrease standing wave between room's front wall and rear wall?

Thanks,
Linn

I'd suggest tracking room. I mean what engineer wants to see a sweaty band trying to show off and look cool anyway? And if you wanna see the band, to make sure they're not wrecking the place/fucking about with expensive equipment, just make sure the control room is darker than the tracking room.

And also, non symmetry is not really a problem in a tracking room, but I wouldn't advise it in a control room.

 

[bpape]

Very nice article.

I can certainly appreciate that the varied space between the glass will actually act like the average volume spacing similar to a membrane type absorber of varying depth.

While having 2 different thicknesses of glass may give the glass itself 2 different resonances, the resonance of the space should though still be the same as you stated. I guess I look at this the same way as the myth about using 2 different thicknesses of drywall when doing a room. There may be a TINY bit of difference but IMO, you're better off with more mass for better iso as an advantage over any slight difference in resonance.

Bryan