Conceptual question about front-loaded horn design

[Entropy455]

I have a conceptual question that I’ve been unable to answer. Specifically, in example 1 above (a hypothetical 20-Hz exponential bass horn - please forgive the crudeness of my Microsoft paint drawing) - I’ve got a 12” driver (Sd = 500 cm^2), mated with a 167 cm^2 throat, for a compression ratio of 3:1.

Question: if I add a second driver (as shown in Example 2 - to achieve greater overall output from the horn), do simply double the Sd value when computing my new compression ratio? I.E. a resultant 6:1 compression ratio – provided my 167 cm^2 throat size remained unchanged? I know this seems like an extremely trivial question, but I’ve been unable to find the answer. And I’m not even sure that adding a second driver is a good idea. . . . Which is why I’m asking.

Assuming it is a good idea - is readjusting the compression ratio back down to 3 as simple as shortening the short-end of the horn (to double the throat area, per example 3)?

Thanks!
Eric.M

 

[bentoronto]

In the absence of helpful replies here, you should present your questions to the subwoofer forum, the natural home for it.

Are you aware of the size of the horn you are talking about? It is gigantic beyond home music room conception.

I used a Klipshorn folded bass corner horn for about 50 years. Inconceivably wonderful in some aspects (room filling clean bass which, oddly enough, makes a corner horn a great pairing with dipole ESLs, no kidding) but not others (can't go very low; do you have a clean 5 watt amp?).

Ben

 

[Entropy455]

I’ll repost in the subwoofer forum.

I’ve got a few Crown amps that seem pretty clean (damping factor greater than 5000). And I’m with you on the size of the horns. They’re big. . . .