for what it's worth...
I owned modded IM716 (supposed er4 clones) and the SA6 are just as detailed...but have more impact and ompth, and are more warm sounding, and don't get fatiguing at all (which the IM716 did). The SA6 IMO are more fun to listen to, and they have all the details that the IM716 had.
The only downfall is the SA6 (with no music on) don't isolate as well, but once the music is on well the music helps block out lots of noise from the outside =)
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