Okay, at last. Impedance curve using an old 30WPC stereo amp I dug out of storage.
I didn't want to risk my 450WPC IB amp on this test with all those bare wires dangling all over the place..
I think this is absolute confirmation that my AE IB15 drivers don't remotely match the claimed 16Hz spec. The green line is my soundcard-only plot.
I suppose I ought to test all four just to double check because I get a very different response between the two pairs in the same manifold.
They don't even look the same in some minor details.
