Ignoramus28225 wrote:
....
I see. Thanks. I am curious, how do they make 1.2 FARAD capacitors
that they sell for car music. It would seem that if they were made
using the same technology, they would need to be like 250 times bigger
than my capacitors!

They are electrolytic capacitors and use a carbon aerogel as one
of the "plates". Aerogels have a very large surface area per volume.

Anthony