[eparson]

What are the technical advantages of  slot loaded the PR that VMPS utilizes on its subwoofers?  I did note that filtering out of unwanted higher frequencies as noted on the web page.  Is this the main reason or are there others? 

everett

[John Casler]

What are the technical advantages of  slot loaded the PR that VMPS utilizes on its subwoofers?  I did note that filtering out of unwanted higher frequencies as noted on the web page.  Is this the main reason or are there others? 

everett

B, might answer that best since he was one of if not the originator of that type of system.  I have only seen it used one other place.  I think it was Richard Vandersteen in a sub or two.

My best guess was a type of directional phasing of the combined wave launch of the "woofer system", as a whole, but that is just a guess, and the ability to create a "pressure damping" due to the size of the slot opening.

What ever it is, it seems to work better than any other bass system I have heard.

[Brian Cheney]

When I invented this back in 1979 I did so to have the slot work as an acoustic low pass filter and also so there would be a constant distance for the PR to the floor (a front load), which made its behavior more predictable.

No changes in the laws of physics since then, fortunately.

Four years later at the AES I saw a Klipsch speaker doing the same thing and felt rather vindicated.