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Deep bass is "must have" for soundstage size. Generally, bigger drivers are capable to move more air. But this an assumption with any specific...
Any comparisons to ER-4P/S? XBA-3?
I tried HF3 - it is a bit off "Ety sound" to me. It is a blend of ER-4P and Shure E4c. The latter is "old-good" model with remarkably smooth sound...
Check the seal, try smaller tips and deeper fit.