Acoustic impedance of the enclosure
Rear admittance seen by a loudspeaker (neglecting Raf) can thus be written as
, which leads to a rear impedance:
,
where
.
Ratio between volume velocities is:
.
Impedance and volume velocity analysis is given in the table below.
Frequency |
|
|
|
Volume velocity ratio |
|
|
|
Impedance seen by the speaker |
|
|
|
Effect of a resonator | Added mass | Volume velocity amplification | Sealed enclosure |
