Back in the mid to late 1970's these were extremely popular in recording studios.
Rockers would listen to the playback on these. Wonderful speakers for listening close up or as they say "near field". I have them on my computer desk with a nice Marantz 2235B receiver. The turntable that I'm using in this set up is my Pioneer PL-71 with an Empire 2000 E/III cartridge and original stylus. I am really liking this set up!