It originally appeared as Figure 2 in: Avoiding Flanking Noise Transmission by V. Young-Benidickson Originally published in "RAIC Update" 16(2), 1992, p. 7-8         |
and the multi frequency wall transmission loss data is from: IR761 Gypsum Board Walls: Transmission Loss Data by R.E. Halliwell, T.R.T. Nightingale, A.C.C. Warnock, J.A. Birta Internal Report IRC-IR-761, March 1998 |