Punisher Extension Development Thread

citizensc wrote: Elliot Thompson wrote: I distinctly remember Contour saying he did not want the boxes to go low based on the type of music he was using. Why is the will of the designer relivent? Will the horn not just follow the laws of physics? Do longer horns with bigger mouths not reach lower frequencies? The sims support this, look at the one for the Ciare 12.00sw, the efficiency starts to fall off about 7 or 8 hz lower with the horn extension.

The expansion rate to the mouth plays a factor. If the box is already expanded to a particular frequency at the mouth, adding on an extension to the mouth can just make the box louder without any means of low frequency extension. You need to have pressure buildup in order to achieve lower frequencies at a greater intensity. 

So what happens when there is no pressure buildup below the Punisher's horn cutoff point and, you add a large exponential horn extension in front of the Punisher's horn mouth to extend the low frequency response? Nothing. This is due to no low frequency pressure buildup at the extended frequencies you are trying to achieve. There are principals of a horn you need to follow and, you are just looking at one part of the equation.

citizensc wrote: Elliot Thompson wrote: How much SPL? Theoretically, +3dB. Realistically, unknown. This is what happens when you start thinking outside the box. You have to accept there is a 50/50 chance your idea may or may not work. I go through this all the time so I am letting you know in advance. This bit im not really sure of, I dont think hornresp accounts for directivity (someone correct me if im wrong here) so it wont show the real improvement. The punisher does have a small mouth for a bass horn and is a rather small cab so I would imagine its directivity control is quite bad meaning there is a lot of room for improvement. Would it be naive to have expectations of 3-5 dB improvement measured on axis from 5m away?