using 10" sonotubes for ports

[05_ZX636 10+ year member]

I like the way millertimes build looked when he had the 2 bl 18's, so when i build new box since i took the 4th order out i am goin to try these. Can somebody check this: 49" w x 30" d x 25" H = 18.4 cubes before subs and port, 2 10" sonotubes 14.75" long each on the psp calculator is 33 hz? Does this sound right? thanks for any help

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