Vintage "Square" compression driver

[maxserg]

I've seen only on documentation (a photocopy of) on a never seen (real life)prototype driver. The only thing... it was a rectangular driver with a 4" voice coil and a rating of 100WRMS (if my memory serves me well!) It was a nidrange driver and was around 1971-72. Any expert or peoples who worked at JB Lansing at this time? That period covers the use of the Crown DC-300 for PA systems.

Very curious about this and never heard or see after. ???? This driver seemed huge!

[earspoiledbyjbl]

The 2490H is the only thing close to your Q it has a 3" exit and a 4" voice coil and is for mid compression freq.

[earspoiledbyjbl]

It does 250Hz to 3000Hz and the horn is the 2393 when being xover it need to be 18oct slope for best power handling.