Whizzer cone removal

You might first try the non-damaging/easily reversible 98 cents open cell foam tweak.

Cut a thin strip of open cell foam and circle it around the outside bottom of the whizzer cone.

Readily available open cell foam is the Gray foam stripping often supplied with window mount air conditioners.

Or, just order open cell foam online.

Try difference sizes/amounts and vary the placement.

I use vintage Elac S517 drivers with whizzer cones (not listed with my setup) and have used various other vintage whizzer'd units from England and Japan.

DeKay

Addendum...

As the "edit" function seems to be MIA...

Best not to "chop" the Decware drivers as they seem to be one-offs/custom-built and you can't go back.

DeKay

Here's a pic of round foam dots used (I wrapped a strip of open cell foam around the back of the whizzer instead).

http://www.hifisentralen.no/forumet/attachments/diy-og-utvikling-ha-yttalere-forsterkere-etc/83379d1...

I first read about it @ Lowther America or DIY Audio.

DeKay