Sony IER Z1R VS Earsonics S-EM9

Youtube Video Summary

Sony’s IER-Z1R puts on a proper flagship show from the jump: an exquisite unboxing, hefty zirconium shells, and faceplates with a watch-grade finish that scream luxury. Sonically, the focus is the sub-bass—massive extension, physical rumble, and satisfying decay that together form a true basshead endgame. Compared to the 64 Audio U12t, the Z1R’s low end is clearly superior in slam and texture, while avoiding plasticky BA timbre; resolution is strong overall, even if the U12t keeps a slight edge in microdetail.

The tuning skews moderately V-shaped: male vocals can sound a touch hollow from a dip around the lower mids, whereas female vocals pop with presence and clarity—ideal for J-/K-pop and anime OSTs. Treble carries good extension but emphasizes stick impact that can draw attention over the air up top, a preference call more than a flaw. Staging is notable: among IEMs, the Z1R projects a “speaker-like” scale with one of the widest head-stages heard—still IEM-bound, but grander than most peers, and paired with a warm, engaging timbre.

The catch is fit and ergonomics. The shells are large and unforgiving, and for many ears comfort collapses within minutes; seal is extremely sensitive, with a poor fit turning the treble peaky around ~6 kHz. It’s the single biggest caveat: audition first rather than blind-buying. When the fit cooperates, this is a phenomenal-sounding flagship—arguably preferred over U12t for the right genres—yet its brilliance is undercut by comfort risks that will be a deal-breaker for some.