[Don Pearce[_3_]]

On Mon, 12 Nov 2018 13:54:13 -0800 (PST), wrote:

On Monday, November 12, 2018 at 4:22:25 PM UTC-5, Mike Rivers wrote:
On 11/12/2018 2:44 PM, Don Pearce wrote:
Wire is just wire when source impedance, load impedance and wire
impedance are the same. Any other condition, the length of the wire
will introduce frequency response errors.





Even at RF frequencies, only ONE end (either end) needs to be properly matched to Zo and the reflection will be absorbed and there will be no frequency response issues (other than the inherent loss of the cable increasing with frequency).

I agree, at audio frequencies and practical lengths, the R is the only issue.

mark

It has to be the load end that is matched otherwise there will be
standing waves. A mismatch at the source end alone will result in
overall level error. Actually it is still in theory a standing wave,
but it is one from a zero length line, so it just looks like a
broadband incorrect impedance.

d

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