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Hi Klaus,

Spec sheet on the bass driver you plan to use here:
http://www.greatplainsaudio.com/downloads/515_G.pdf 

Just to be clear, mid bass to me means from 60Hz - 240Hz.

Throat diameter : 9.9 inches ?
I'm just a beginner, and will refrain from writing about things I haven't proven for myself (I have only "proven it" in the case of the upper bass horns), but if you haven't already done so, read the following thread (scroll down to the paragraph near the image of the black JBL enclosure):
http://www.goodsoundclub.com/Forums/ShowPost.aspx?postID=806#806 

Regarding the alnico option: If it were me, I would probably buy one of each driver (ferrite and alnico) and compare them.

Crossing the bass horn at 500Hz to an S2 : If using a 6dB/octave slope, I might start to get a bit nervous about running an S2 that low.

I use one pair of S2s to cover a theoretical 800Hz to 3200Hz into a 180Hz Tractrix, and have heard no signs of distress at all (still need to measure the output and see where it is really rolling off when taking into account the combined effects of the horn+room).

The diaphragms you describe seem to be one of the later versions, which are referred to as the "plastic-suspended" variety.

Best of luck,

jd*

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