the subwoofer i'm making it for is a pioneer ts-w3001d4 i'm thinking with a 1 inch thikcness (not sure how much they come in) i can it 16" height 18" width and 14" depth

with that i'll be at 1.55556 cu.ft and the max recommendation for this is 1.6 cu.ft

but i'm confused about the port... is it a circle port? because its says for the port
3"Dia.(76mm) x 2.5"(64mm)

so is that 3 inch diameter and 2.5 inch long?

BTW..... what kinda wood would be best to make it with?

thanks for the replys