Petroff Audio Labs / Petroff Audio Research is creation of one Michael Petroff. I worked for Mike back in the late 80's building very elaborate home systems. I cannot recall where we sourced the drivers, but they were custom made. Later we started our own line of tube subwoofers for the car audio market under the company IntegralAudio. Mike also sold several analog circuit patents (mostly to control stage/imaging) to Harmon Int'l/JBL et al.
You have a very early set. Hope you enjoy them.
You have a very early set. Hope you enjoy them.