Martin SB115 midbass horn - rear chamber size issue

[David McBean]

I’ve never really achieved the predicted response in reality with ‘pro horns’ due to the size putting the mouth a good metre away from any wall in practice.

The "principle of images" concept only really applies when the dimensions of the radiator and the distance from the boundary walls are small compared to the wavelength.

 

[Rewind]

The shortest wavelength here is 200Hz which is 1.5 meters. And the driver is 15". Not sure how that works.

 

[AllenB]

The radiator here can mean the horn mouth.

 

[Rewind]

Then 4400cm^3. 112cm on the widest point.