Not so fat head
1000+ Head-Fier
Not my point…. it’s just this is the trend in the $3k to $6k IEM space…. Yes the single DD Sennheiser’s are very good. Check out the water cooler, lots of info there..I do not think it's driver thing, we have perfectly capable single DD driver IEMs (e.g. Senns IE600) or earbuds like Yincrow RW-3000 that can outshine some multi driver IEMs.
Most likely limited by small enclosure inferior DACs is what drags performance down. But I am fully open to any other explanation.