Sound Transmission Loss of Masonry Walls
“The most common alteration made to the walls in these tests is the addition of layers of finishing materials, most frequently gypsum wallboard (sheetrock). One might imagine that the addition of extra layers of material to a wall could only improve its performance; this is not necessarily true.”

ir586 – Sound transmission loss thru block
“Sound Transmission Loss Measurements Through 190 mm and 140 mm blocks with Added Drywall and Through Cavity Block Walls”

A Simple model of the sound insulation of gypsum board on resilient supports
“A simple model is developed to explain the effects of adding resilient channels to a rigid double leaf wall or floor system. The surface layers mounted on resilient channels are treated as a vibration isolator with a fundamental resonance frequency determined by the combination of the stiffness of the resilient channels and the stiffness of the air cavity along with the masses of the surface layers.”

Quad-Lock Insulated Concrete Forms

Residential Steel Framing: Fire and Acoustic Details
“Cold-formed steel has been widely used in commercial buildings, especially in non-load bearing (partitions) and curtain wall applications. Cold-formed steel sections are increasingly being used as primary structural members, such as beams, floor joists, and load-bearing walls in commercial and residential construction.”

USG Installation and Application Guides

“Sound control refers to the ability to attenuate or absorb sound passing through a partition, floor or ceiling assembly. Depending on the function of the space, acoustical needs can be broken down into sound control between spaces, sound control within a space, and listening efficiency within a space. Performance ratings for sound control allow construction of wall, floor and ceiling assemblies that complement the purpose of the space.”

A Study of Techniques to Increase Sound Insulation of Building Elements
Wyle WR 73-5R (3 leaf panel)
“The principals and techniques that pertain to the design of building elements providing high values of sound transmission loss at low cost are presented.”

Triple leaf data
“in october or so we had discussed some triple leaf tests to be presented to these forums.”

Sheetrock transmission loss in wall assemblies

Sheetrock transmission loss data IR 761
“Results of sound transmission measurements to show ability to reproduce the same results after a complete specimen rebuild. The upper curves are data for the nominal STC 57 wall while the lower curves are for the nominal STC 46 wall.”

Noise Isolation Provided by Gypsum Board Partitions
With the exception of partitions built with single wood studs without resilient furrings, there is an approximate 5 point STC rating increase each time the gypsum boards are doubled on either side of the partition. At low frequencies, the transmission loss is increased by about 5 dB for every doubling of the gypsum boards on one side of the partition.

USG The Gypsum Construction Handbook
“Outlines methods for matching systems to specific performance criteria. Covers fire and sound criteria, wood and steel partitions and sound control systems. Specialty systems include area separation walls, cavity shaft walls, fireproofing, curtain wall/fire containment systems, thermal insulation, air water and vapor control.”

Sound Isolation Assembly

Calculation of STC, MTC, OITC and Rw explained
“Note: This document is an extension/adaptation of a document explaining STC and OITC It is expanded (+ additional adjustments and more in-depth comments) with the MTC and RW single number rating.”

Acoustic Shaping
“In the preceding sections we showed that significant forces could be generated in unsteady fields, especially standing wave fields, due to interaction between the field and solid (or liquid) particles.”

A Simple model of the sound insulation of gypsum board on resilient supports
“Although it is often standard procedure to use resilient channels to improve the sound transmission loss of a wall or floor system, there was no simple model of their performance…”

Paul Sabine: Acoustics and Architecture
“Paul Sabine book, I came across Average reduction numbers in decibels. 😯 {Acoustics and Architecture – BIG file (> 16 MB) – SLOW download.”

The worlds cheapest sound isolation tips
“The acoustic design of Outside Broadcast vehicles. E.W. Taylor”

RD 1984/3:Acoustic design of Outside Broadcast Vehicles

The design and application of modular, acoustic diffusing elements. R. Walker
“The design and application of modular, acoustic diffusing elements. R. Walker”

Are my speakers in a null?
I think my speakers are in a null. Briefly, the room is 11ft.8in. wide, 16ft. 4in. deep, with a ceiling of 8ft.

Bob Golds Room Mode Calculator
“For the case of a typical small studio…calculation shows that no frequency is likely to become prominent unless it (has) a high early intensity and a long decay. This condition* is satisfied only by the axial modes, which are therefore the only ones likely to become individually significant.”

IR818 – Measurements of sound insulation in building facades
“This report provides the results of over 100 laboratory measurements of the sound transmission loss of building façade components. These included various wall and roof constructions along with some windows and a number of tests to evaluate the effects of vents on sound insulation. “

NRC-CNRC Main Page
” Research in Construction (NRC-IRC) is the leading construction research agency in Canada, developing innovative solutions for the country’s largest industry. “

STC rating for glass – Sound Solutions
“The STC rating (acoustical properties) of glass are of considerable importance in many applications.”

STC for Steel framed Assemblies
” Estimation of Sound Transmission Class and Impact Insulation Class Rating for Steel Framed Assemblies “

Catalog of STC and IIC Ratings for Wall and Floor/Ceiling Assemblies

“This catalog of sound-rated wall and floor/ceiling assemblies was compiled to enable the user to quickly find a group of construction assemblies having similar sound transmission characteristics. It contains STC assemblies according to the following (Sound Transmission Class) or IIC (Impact Insulation Class) ratings for approximately 500 different construction assemblies ”