I haven't heard them yet. I don't have the 85 gauge wire needed to connect them. The terminals accept smaller gauge than pubic hairs. Lol

I am convinced they don't go down to 40Hz (even at - 10dB) and I doubt whoever designed them knows what a Hz is. Did you read the statement how the amp output impedance must be 8 Ohms? I suppose they could be referring to a tube amp but if so, there are better ways of writing that sentence.

It's a 10 inch woofer with an eighth inch diameter voice coil. Lol

House of the Rising Sone
Out in the mid or far field
Dedicated mid-woofers are over-rated