Does this style of sub "load" the subwoofer and lower Fs?

[DaveFred]

In this push/push Dual Opposed Subwoofer, are they lowering Fs by "loading" the driver with the top and bottom plates?

What side effects are there of doing this?

 

[wonderfulaudio]

There is hardly any constriction of space, I doubt there is any loading at sub frequencies

 

[umut1001]

I think there is no lowering FS effect.It is also not an isobaric configuration.It is just for cancelling harmonics and reduce unwanted vibrations of subwoofer box.And controlled by DSP to give a flatter frequency response.

 

[troystg]

Being boundary loaded helps the mechanical to acoustic transition(impedance matching of sorts). Some call it loading but it is more like coupling.

 

[Juhazi]

A tight slot makes "loading" in nearfield measurement. This ELAC sub will obviously sit on the floor and then lower woofer will get some extra floor gain, but nothing special considering room response in a normal size room.

Line 2000 SUB 2070 – Elac