Tennis ball riser to reduce noise for e-drum kick tower | 網球減震台

I have been hesitating to buy an electronic drum kit because I was worried that the vibration and noise from the bass drum kick would be transmitted to the downstairs neighbors. Sure enough, they complained after I bought it for only two weeks. Last weekend, I followed the online tutorial and made a tennis ball shock absorber platform by myself. The shock absorption effect seems to be good, but it shakes a little when I step on it. But I can barely accept it.
之前一直遲遲沒有入手電子鼓是擔心腳踩大鼓的震動噪音會傳導到樓下，果然才剛買了兩個禮拜就被鄰居抱怨了，上個周末依照網路上教學我自己做了一個網球減震台，減震效果似乎不錯，只是踩起來晃了一點，但免強還可以接受。