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I can’t comfortably comment on how sonically different they were even though I worked for a dealer while both were in production. Obviously, the 4400 was their top of the line at its time a was replaced by the 5000 series during the 7700’s time. Both had similar discrete Class AB amps. If you want to read about the design I can suggest no better resource than it Owners Manual: https://beomanuals.com/manuals/Beomaster/Beomaster%204400/Bang-Olufsen-Beomaster_4400-Owners-Manual.pdf. While you obviously don’t push your Maggies that hard, sometimes you don’t know what you are missing till you hear them with a more authoritative amp. In my case I was using Sony’s venerable TAN-5550 VFET amp which was a great match as it was conservatively rated and I beefed up its power supply.
