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Hi
The caps are DEFINATELY in series, disconnect one and there is no signal.
I proposed one capacitor which would provide DC protection for the transformer in the event of IC failure. I also suggested a way of polarising it, rather than using a bipolar cap which is in effect 2 caps in series internally.
While 100 uF (actually 50uF) might have a -3dB point at 0.318 Hz (calculation not checked) there are a couple of other issues.
There is the possibility of in band resonance with such a low capacitance, and the fact that the transformer requires power to operate, particularly at low frequencies, and the load even if 10K resistive, will be coupled by cables with significant capacitance, both effects increasing the load on the output.
Matt S
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