Have you measured that the volume is correct for the Eclipse sub in that enclosure? Contrary to popular mythology, Box A and Subwoofer B may not be compatable. The box volume must be correct for the sub or you may have much less than enjoyable results, from just poor sounding bass to woofer meltdown. You can use Kitty Litter or just plain water if everything is glassed to calculate volume. Don't forget, once the volume of the box is understood, the volume of the speaker assembly must be subtracted from that volume to equal the actual working air volume that the subwoofer sees. Usually the speaker assembly volume is somewhere in the list of sub properties.
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