Impedances and transmission line effects...

[Gryphon]

Not sure if I've read it right, ignoring for the moment the line L/SHE to E, are you saying that the line ran from S (the sending end) to R (the receiving end) and that there was no  load at L/SHE and that there was a termination load at R of 600 Ohms impedance at R and that the source impedance at S was 600 Ohms?

Back to L/SHE to E.........L/SHE to E, is that length the stub you referred to?

Equalized for music...Anything reactive about that so far as the line is concerned?

Lawrence.

S is the ending end: sending end impedance 600 ohms.  R is the receiving end, terminating impedance 600 ohms.

Nothing at L/SHE except a frame to join the cables S -> L/SHE and L/SHE -> R.  L/SHE -> E is the stub, added overnight by accident.

There is an equaliser at R which contains reactive components, but such that there is no in-band reactive component to the impedance "seen" by the line from L/SHE.

If you can explain the observed effects without invoking transmission line concepts, I'd be fascinated to know. Much cleverer people than me have tried unsuccessfully (doesn't mean it can't be done, of course).