[1] Arnold Schwartz, James Bongiorno, Marty Gersten, Jon Dahlquist, and Richard Shahinian were at different times and at different stages working with the company as engineers to develop speaker models.

[5] Some time around 1968, the company moved headquarters, manufacturing, assembly, and service center to 107 Bruckner Blvd (E 133rd St.) in the Bronx.

[11][12][13][14][15] Three of the company's print advertisements were illustrated by the artist Rick Meyerowitz and ran in publications such as Rolling Stone, National Lampoon, and others in 1973 and 1974.

By 1971, Rectilinear had expanded its product range to include the following speaker models (MSRP prices per speaker):[20] Some of these early 3-way models featured 10" and 12" woofers manufactured by Jensen ("Flex-Air") and CTS (Chicago Telephone Supply), 5" whizzer cone squawkers manufactured by Philips Electronics of the Netherlands, and 2" and 2.5" cone tweeters by Peerless of Denmark.

[25] Although the Rectilinear speakers were distributed through a nationwide network of up to 400 dealers, most of their sales was generated on the East Coast.