port area and SPL?

[haydenlake 0]

I'm somewhat new to using WINISD and I was wondering why there is no SPL increase when a larger area port is used. Although I understand that if the enclosures are tuned to the same frequency their relative resistance is the same but it just seems like a larger port would yeild more spl (in the same fashion horns get really loud).

Can anyone clear this up for me.

I'm not asking about beligerently small port areas but lets say the diff between a 20sq. inch port and a 50. Same sub, box, tuning etc.

Your answer doesn't need to include stuff I have already read in the thread about vortexes and air resistance. (but then again perhaps I missed something)

Thanks,

b

[Jmac 24]

WinISD Pro doesn't calculate SPL differences in port area ...

Try BassBox 6 Pro ...

[haydenlake 0]

WinISD Pro doesn't calculate SPL differences in port area ...

Try BassBox 6 Pro ...

<{POST_SNAPBACK}>

Since I don't have bass box could you tell me some generic differences in SPL given increased port area? Perhaps an example of an estimate?

Thanks,

b