first measurements. ES3.
used a chi-pro rig (iec711 coupler, precision 1/2" mic + preamp, stand), creative emu-0404 adc, dac (+jds labs c5d amplifier). 94dBSPL (+-some error) @ 1kHz.
calibrated raw measurements (not compensated).
stock cables (with mic), and same thick silicone special tips (same tips for almost every iems, similar depth insertion, more in the deep side).
next posts, i'll compare to some silver plated copper cables, and foam tips. and in a few days, comparison with zst, zs5 and zs6.
Blue vs Purple (or unit 1 vs unit 2, i'd need another pair of same color to decide if colors have something to do related to inconsistency between units).
Left vs Right.
there are some differences between units, but also between channels. they are located in bass (from 20Hz to 200Hz, 3-5dB @ 20Hz difference between channels, 4-5dB @ 20Hz difference between units), and [upper]mids (from 1kHz to 5KHz, ~1dB difference between channels, ~3dB between units).
bass & sub-bass boost, but mids climb soon (before 2KHz, i guess that's why they look a bit more mid forwarded than other kzs). upper mids and highs keep constant, in the bright side, but not overloaded (moderated peaks at 2, 3, 5, 8.5, and 11 kHz).
ES3b: blue, ES3p: purple. CSt: stock cable. TLk: special tips.