Whats size cap would I use on a 4x6 dash speaker

[jetmech727 10+ year member]

I've got 5.25 components in a kick panel, the tweater is obviously running off the supplied crossover. I also have 4x6 dash speakers, all running off the channel A of a PG Ryval 4 channel amp that is 2 ohm stable in stereo. I have the amp set to 100hz high pass, however I want to cut out way more bottom end to the 4x6 dash speakers. Is there a cap size you would recomend? I'd like to keep it in the mid to highend freq. There 2 way, but they look like there going to bounce right out of the dash at this point.

Thanks

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