ManualThe complete Handbook is still in draft status
It is a quarter wavelength horn for the Fun 10, Fun 13 and Fun 17,
it is a compression chamber bass horn for the big Fun 17 and the big Fun 20. The working principle is clarified here on the left.
Being a bass horn with opening to the floor the loudspeaker does have some (smaller) special requirements: they have to have a certain distance from the floor in order to be able to give the right amount of bass.
• lowering the loudspeakers brings more deep bass but causes a small sound pressure decrease just above the tuning frequency that can be balanced using wall effect. To have clarification about this, please take a look at the next chapter, Bass Reflex
• lowering the back side of the loudspeakers lift the height of the theoretic sweet spot