Having massive bass is great but it doesn't count unless you can hear everything else! There are 3 pairs of JL Audio ZR series components in Rubicon V3! We fabricated these kick panel pods for 1 of the 3 pairs. The other two are in the factory locations. I won't say what these amazing ZR's replaced.. But I will say that they started with a F. ZR's are the best of the best. No question.