Bass Horn throat

Hello

I am working on my first bass horn and I have trouble understanding how to calculate and model the horn throat.

here I have gathered some designs. For example this one has a Hornresp screenshot - what two figures do I have to multiply to get the 180,50 cm2 ?

It looks like an offset horn but Hornresp says ND.

August

It looks like an offset horn but Hornresp says ND

The Punisher might actually be developed before Hornresp could simulate offset horns.

You can simulate an offset horn as a regular horn. Often the offset part is simulated as front chamber volume instead, which will give similar results, as simulating as an offset horn. The smaller the offset part is, the smaller the influence and usually that's just above the pass band of an bass horn anyway. For >120 Hz that's a different matter.

Do I calculate S1 by multiplying 378x144?

And calculate the volume inside the speaker cone as front chamber volume, would be one way to do it.

Johan