I just figured out that FFBREQ printed on some of these 5235 crossover cards means ... Flat Front Bi-Radial EQ! I assume this also means these would be 18dB/O cards! ?
Is an Altec 811B sectoral horn close to what JBL is calling a Flat Front Bi-Radial ? Aren't these 811 Bi-Radial in the vertical plane?
Please enlighten me.

Thanks,

Tom