Does the size of the passive radiator matter?
Passive radiators are very sensitive to the surface area of their moving assembly. The larger the better usually until either the passive is too large for the cabinet, or the moving mass of the passive is too large to be used reliably. Larger passives will need more mass to tune to the same frequency as smaller passives. Larger PR area is beneficial as it lowers the effect of the PR Vas on the cabinet, increases the Qms of the passive closer to that of a port, lowers the PR “notch” in frequency, and can allow more output before the PR reaches its suspension limits. All of these combine to give more LF output.
