Chris: Consumer impedance is HI Z (10-20K) not 8 ohms...

Ah so... I misunderstood that part. Further:

I was wondering about that series cap thing myself. I've been retired for a
dozen years but it didn't look right. I expected a network with different
values at each port. But I recalled it being a suggestion from Hamilton, the
maker of the Rangemaster AM1000, a Part 15 AM transmitter.

The Radio Shack transformer was my own suggestion (now moot) to the fellow,
whom I recall asking about matching a CD player to a line input.

Even in my old age, I need to resume checking other people's suggestions myself
before recommending them to anyone else. (Sigh...)

Bill,
K5BY