solderdude
Grand Contributor
I think that an echo will show up in a frequency response sweep, assuming the echo is a constant, at multiples of f = 2/t where t is the echo time, because of constructive and destructive interference.
Yes it will but only far above the audible band or zoomed in tremendously in time.
I don't think it will show up visibly in a plot using 10Hz to 50kHz or so.
It's what the speaker cable guy (that never came through for Amir) spoke about and what Don showed in that thread.
And ... as Krunok mentioned, it would disappear after a month or so never to return again.