If you have a spare mmcx cable..you might wanna consider the tennmak piano. One of the deepest subbass iem that I've heard which only cost $11 ear head, extra nozzle mesh cover and several tips only.. Including the cable will cost around $28 though. The cable in the photo is my spare balanced mmcx from penon. I'm not a basshead but I was pleasently surpised by the depth of it's subbass that rumbles like crazy.. You can search the tennmak piano at aliexpress..