Does Lamm L1 sounds as sweet as Lamm LL2 ???

T7279mw,

Double glassing and sound proofing are two different things. Sound proof glass is constructed from several layers of glass, glued together (like car windshild).

Also, the layers of glass are diffferent thicknesses, in order to have different resonant frequencies (a friend of mine who's an audiophile is in the window business).

Rcprince - correct. That is how my window glass is constructed. In my case Rw (that is the parameter used to describe the noise attenuation of the window) = 44dB.

Thanks again guys :::

I can't help imagining a house using only automotive windshields for the glass (shades of Gaudi...)!!!

I didn't know that the laminated technology is also used in residential architecture.

I should be a bit embarrassed that it didn't occur to me ::: I actually deal with the stuff all the time designing for the auto industry; the company I work for offers cars with laminated glass all around, as well as on the roof, mostly in the interest of acoustic isolation... lots of trouble 'cuz you can't get the stuff to curve in both directions, but it does keep more of the sound out than a single layer of tempered glass ::: Not too long ago in their S Class, Mercedes offered proper double glazing with an air gap (in some cases with a matrix of little transparent spacers) ::: they've since dropped it; as one might imagine, in the end laminated is less expensive and definitely more desirable in a crash. Both solutions utilize glass of varying thickness. Obviously laminated is more convenient; don't know which solution is most effective as an acoustic barrier (I will ask the boyz at work who are supposed to know that sort of thing ::: or the friend of Rprince could probably tell us).

One thing is for sure; hanging an additional layer of laminated glass over the top of my existing traditional double glass, would be better than another layer of normal glass.

Thanks again!