Kevin Roche enclosed a proposal for the sound system at Miller House from Sight and Sound Company in Santa Fe, New Mexico. The proposal also includes advertisements for a speaker selector that would control a multi-speaker installation.

Kevin Roche to J. Irwin Miller, 5 March 1956, 1/6, Miller House and Garden Collection, IMA Archives, Indianapolis Museum of Art, Indianapolis, Indiana (MHG_Ia_B001_f006_052-057)