reflex silencer and cabinet

[tamerlano]

looking on the net I came across this particular the two attached images

both the reflex tube and the box use helmholtz resonators to break down the standing waves and improve the sound.

The question is: seeing that the measurements of the box and the reflex duct are known, is it possible to create an Excel sheet to calculate the resonator?
It seems like a very simple but at the same time effective idea.

maybe you can also do a retrofit to existing speakers

 

[johanhaggstrom]

I used this calculator for my build:
HiFi Loudspeaker Design

Worked well together with a 3D printer for creating the actual resonator.
Should work well also for retro fits.

 

[johanhaggstrom]

If I understand the theory correct, the opening of the Helmholz space should be placed where the air pressure is high, not where the air is moving the most.

This means close to the wall or corner of the standing wave. If placed elsewhere, the effect will be less optimal.