>Does anyone have a working example of the IIR filter block in GNU
>Radio Companion that I can see, and the filter designer app, table, or
>equation which generated the coefficients?

Could you try grc files attached in 
http://lists.gnu.org/archive/html/discuss-gnuradio/2012-08/msg00128.html. I 
think those were tested with gnuradio-3.6.1.

You can either use gr_filter_design tool (new version) or scipy functions 
(scipy.signal.iirdesign/scipy.signal.iirfilter) for designing IIR filters.

>Negating A coeffs doesn't appear fix the issue in either case.

To know more about the negation of  "a coeffs" please follow this thread: 
http://www.ruby-forum.com/topic/4408052.

-Sreeraj
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