average volume needed for 2 15's ported?

[walkychalky 10+ year member]

my friend has 2 15's but i cant find the specs for them and i dont now what the rec volume is.....so is there a suggestion on what volume he should make the box.....like a common amount needed for 2 15's.........tuning will be 35 Hz if that matters

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[DBfan187 5,000+ posts]

depends on your subs specs.

what sub is it? model#?

General rule of thumb is 3+cF each, but not for every sub.

 

[walkychalky 10+ year member]

i dont know.....i think imma see em tonight......so i'll let u know.....