WHAT? I wonder how you found out about that trick! I have just 1 earphone with loads of driver flex from a brand that shouldn't be named nor mentioned, dont get that with any KZ. Thanks for this suggestion, will definitelly try that trick, ZS10 with a bit more bass would be awesome and maybe prevent me from buying the ZS7 that I know physically hurts to use just to have a basshead Hybrid KZ. Bu the way, the bassiest hybrid KZ I tried is the (very neglected, here) ZSR, wonder if its similar. Yes, the ZSR has a void around 4kz, It was a time when KZ had loads of complains of killer highs and I think it was their 1st try to tame its highs. Its also the bassiest Hybrid KZ I have (was just wondering about it vs ZS7), with a lot of emphasis in the subbass. (its low frequencies are very BUSY, dont expect a fast and precise bass). But Im not sure exactly what you want here... for what I understood you like treble and want a bright earphone that doesnt hurt you? I think you should look at their newer models, ZS10Pro came to my mind, they improved their try-not-to-hurt-you game (you dont feel some frequencies are missing), except if you chose a ZS7 (physically hurt you) or a AS16 (its highs will hurt you), but if you want to be hurt both ways you need to revisit the ZS6. PS.: I would wait for more replies as I dont trust my own judgement alone.