Abbingdon Music Research  Abbingdon Music Research (AMR) is one of the UK's largest manufacturers of high-end audio systems. While most of their acclaim has come from their amplifiers and CD players  (their flagship being the Reference Series System with a price of roughly $100K), they also make phono pre-amplifier, loudspeakers, cables and accessories. Founded in 2000, AMR is based in London, United Kingdom. It is a subsidiary of the Abbingdon Global Group. March 2000 – AMR was formed and design work first commenced on the CD-77.  iFi Audio is a subsidiary of AMR that manufactures high-end audio products: amplifiers, Active Buffer/Preamplifiers, DACs and USB filters.