1. Screenshot of some steps.
2. Finished
Product list:
25V100UF https://www.utsource.net/itm/p/6484473.html
16V47UF https://www.utsource.net/itm/p/6484548.html
More details, pls check the video on Youtube:
DIY SIMPLE BASS WITH CAPACITOR- high bass| Increase Bass Trick
Most of the amplifiers work under 40 to 60V, so your caps in 25V won't last long. 2nd order filters are much more efficient than your 3dB/oct which allows all the medium spectrum in the bass speaker, it doesn't like that at all !