A study is being made of sound transmission of walls, doors, and panels at the Riverbank Acoustical Laboratories with the purpose of relating the measurements more closely to the properties of the test wall alone, instead of the test wall plus the adjoining rooms. The possibility is being investigated of measuring the effective “impedance” of a wall with random distribution of incident sound. This method is similar to that used at Harvard in tests on small airplane panels for sound at normal incidence. In order to allow for phase differences in the motion of the test wall, measurement of the transmitted sound is to be made at a distance from the wall in a long narrow room with one end covered by absorbing wedges. To evaluate test conditions, the sound fields have been explored on either side of a test wall. Pressure distribution on the source side (reverberation chamber) of the wall is given as a function of frequency and reflector position. This also indicates the state of “randomness” in the reverberation room. Results are also given for preliminary tests on the transmitted sound field.