Net volume question

[96civ 10+ year member]

When designing a ported box, what are good net volumes to build at for 10", 12", 15", etc.? I've heard 2.5ft^3 for 12" is a good range at around 33-40in^2 port area to have a good sound, but I don't know if that's for each sub or for high performance or what. Also what does a larger or smaller net volume do to the bass response to the system?

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[squeak9798 5,000+ posts]

When designing a ported box, what are good net volumes to build at for 10", 12", 15", etc.?

Completely, utterly and totally depends on the specific subwoofer in question. You can't just say "I have a 12" sub, so I'll build the enclosure 2.5cuft net". It is going to vary subwoofer to subwoofer.

 

[96civ 10+ year member]

I realize that, so I'm assuming there must be an equation to determine the net volume of a sub based on the T/S parameters. My first post was kinda dumb because I didn't have a lot of time to think it over, but I just wanted to get my point across. The reason why I'm asking is that I'm going to be building and designing a good amount of boxes in the near future for local people and I don't feel like annoying anyone by asking the net volume and port area for each different sub, ya know?