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If the load impedance is indeed around 965K, a 0.005uF cap...

...will create a HP-filter of 33Hz. That cap would be a pair of 0.01s in series. The drivers are beginning to roll off acoustically around 200Hz, so 33Hz is about 2-1/2 octaves below their audible-output range.
Tin-eared audiofool, large-scale-Classical music lover, and damned-amateur fotografer.
William Bruce Cameron: "...not everything that can be counted counts, and not everything that counts can be counted."

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