Could it be something to do with the receivers themselves? For instance, my 2008 Integra receiver does not support EQ or the use of certain listening modes on 192 kHz material, but that stuff does work with 96 kHz and below material. If I had any EQ set and was switching back and forth between sampling rates, then it'd be switching on and off the EQ automatically, behind the scenes so to speak.
TCL R615 | Sony UBP-X700 | Integra DTR-7.8 | Front = Klipsch KLF-20 | Center & Surrounds = Klipsch KG 5.5 | Subwoofers = 2x sealed Velodyne ULD-15 and 6x ported subs with miniDSP 2x4
Large JBL cinema horns under construction and testing.
"The more to the right it is turned, the greater the volume."