Acoustic sound walls, Noise transmission barrier walls and Lamaphon
Acoustic sound walls
Acoustic sound walls and lamaphon known as THX walls and Acoustic baffle wall used with cinema high-performance sound systems in multiplex cinemas, sound studios, foley rooms to mitigating any reverberation, interference or noise pollution from behind the projection screen with perforations.
The acoustic sound walls are used in conjunction with cinema stage speakers, by physically surrounding them and only allowing the minimum amount of sound from bouncing around in the void and back out.
Sound walls are built out of timber and two layers of plasterboard then lamaphon is fitted to the plasterboard. The lamaphon stops reverberation behind the cinema projection screen and the sound wall. We recommend a one-meter void behind acoustic sound wall this is so future engineers or technicians work on the speakers, masking system or other equipment within the void.
Cinema projection screen frame is then installed onto the acoustic sound wall, The moving masking system and curtain track motors are installed in the void behind the sound wall, as are all noisy amplifiers and other equipment polluting the auditorium.
The speakers are then mounted on speaker platforms built as part of the acoustic sound wall, The speakers go flash with the 50mm lamaphon, we aim for cinema stage speakers to be 50mm away from the perforations of the cinema projection screen surface, This allows the sound to go straight through the cinema projection screen surface and directed to exactly where it’s needed.
Noise transmission barrier walls
Noise transmission barrier walls (NTBW) are used to stop sound traveling through the wall for instance in an office for privacy stopping noise penetrating through the walls, commonly referred to as soundproofing.
NTBW is constructed on an existing wall, First 30mm timbers batons are placed on the wall, Then Class 'O' 30mm High mass acoustic foam is installed between the batons, 15mm resilient channel is fixed to buttons across the foam, acoustic plasterboard is then fixed to the resilient bar, this leaves 15mm air gap between the plasterboard and the high mass acoustic foam, Then we install our Clothgrip softwall treatment, pattresses for Plug sockets, TV's, speakers, CCTV etc, are position before the final cloth is installed, giving a flash wall finish to what's installed after the cloth.
Lamaphon
Lamaphon is a tissue face dance mineral fiber with a Class ‘O' fire-rating, used in most mainstream cinemas, multiplexers and screening rooms where the sound has to be of the best possible quality but not essential to the work environment like a sound studio.
Fitted to the rear of the projection screen wall, it stops sound bouncing behind the back of the stage wall and screen surface. This pushes a crisper sound forward into the auditorium, improving the sound quality for the audience.
