This is a calculator to help determine what size you need and a couple links to some inexpensive 200 microfarad caps. You can spend much more on caps if you want, but I seriously doubt you would hear any difference in your application.

High Pass Filter Calculator

https://www.parts-express.com/200uf-...citor--027-366

https://www.amazon.com/BB-199-199-BA...dp/B01BCFK268/