A little speaker porn strip tease...
First off, "four" seems like the right quantity to order these in. I received one full box, packed inside another box, nicely padded with Styrofoam chunks.
Carrying these in from my porch - my first impression is "damn these are heavy!" It's impressive, but I'm glad they'll be low in my door because I like the handling of my light, fun car.
You can see why - these are XBL^2 midbass drivers. The top plate needs to be thick, similar to an underhung driver, even - the only difference being there's a circumferencial deep groove circling the inside, changing the magnetic field... allowing BL to stay constant across huge excursion when paired with a voice coil of correct length.
They took all interesting approach - machining two half-top-plates and stacking them (one inverted), to keep costs down. Smart.
Going to set two up in little sealed test cabinets and park those on the floor roughly where my door speakers would be, for now.
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