A part of a new project I'm working on has a mid-bass box, closed, net volume 16.5 litres. Internal dimensions are 44cm x 31cm x 15cm. 5cm insulation on sides and back.
First box is put together. The impedance plot is very close to predicted.
When looking at the first response measurements it seems I have some issues ~700Hz, which matches the length of the box. Measurements are blue - nearfield, and green at 30cm in a hostile environment.
This issue must be addressed before I move.
Anyone with a good advice on this issue?
My first ideas are to:
a) add insulation at these sides
b) twist one (or both) of the side walls a few degrees
This driver will be used from 150-200Hz to 800-1000Hz.