I've come across those many times while searching for "Technics SH" on Jauce and Buyee (in search of SH-400's, SH-3433's, and SH-3480's and 3580's), and some day I'll pick one up to see what it is they actually do.
After thinking about this for a bit, I can think of a scenario for use; listening to some simple instrumentation to create more of a live cathedral sound. I'm thinking of music like the piano works of Michael Whalen etc.