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Ralph...coupling caps in M-60 Mk. 3.3--what's the impedance...

Posted by jeffreybehr on March 16, 2016 at 12:51:22:
...the 0.1uF couplers are driving? Are these couplers outside or within the feedback loop of this Mk. 3.3?
The reason I ask is that I'll soon be buying a new pair of these, and I need a high-pass filter in the range of 25- to 50Hz* to drive the MR panels of my speakers (Serenity Super-7s), and I don't know the impedance value to plug into the formula.
* The exact value isn't critical; the filters will be mostly DC- and pulse-blockers and amp-power savers. No sense in consuming amp power by sending low- and mid-bass energy to the MR drivers--which are NOT replaceable!