Right - as I recall, the HHB gold CD-Rs were made by Mitsui. And, their first CD recorder - the one with the upside-down disc loading - was a Pioneer consumer machine outfitted with balanced digital and analog I/O. That was my first CD recorder at Crane and it worked great until it failed.
Audio Engineer Emeritus
The Crane School of Music
SUNY at Potsdam, NY 13676
"Great art presupposes the alert mind of the educated listener."
"A true artist doesn't want to be admired, he wants to be believed."
"If you design an audio system based on the premise that nothing is audible,
on that system nothing will be audible."
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HHB had most of their equipment made by some manufacturer that was specialized in that brand. HHB was more or less a selling organization.
My guess is that also the HHB DAT cassettes were made by some major manufacturer.