Thanks for the write-up! .....I also acknowledged them to have quick bass/sub-bass control, great detail retrieval and instrument separation. Glad I was able to send you the pair!
.....I usually used wide-bore silicone tips to get an airy like midrange, while treble played less sibilant or harsh. Adding tissue or cutting a tiny piece of sponge and adding it to the nozzle is also a great idea. Thanks!
If Ivery made an IS-1 "whatever-the-name-would-be" with the same driver as the "Liberty" but a much tamed treble, it would be such an easy recommendation at just $10. It really does a great job as it is, but only with modifications. Imagine an even sounding, well-controlled and sub-bassy in-ear that can compete with the Xiaomi Piston Colorful Starter edition and is slightly better than most of Knowledge Zenith's offerings - I think it would have been an incredibly well-selling product if they drastically tamed the stock tonality's treble.