2 JL 13's, 1 Kicker 15", or 2" Kicker 15's

[97srad750 10+ year member]

Assuming all these setups have the same amount of power, and are built to spec which would be the loudest

2 sealed JL 13W1's

1 ported Kicker Comp VR 15

2 sealed Kicker Comp VR 15

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[AndonD454 10+ year member]

you could probably make the single ported cvr the loudest at a very small range of frequencies.. but loudest across the board would probably go to the 2 sealed cvr 15s.