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In Reply to: RE: Help needed: Tympani IVa midrange driver problem posted by mikebarney on April 07, 2021 at 12:50:52
I would not expect significant output from at 20 Hz and 10 kHz from the mid panel so I assume you are running all panels and the tweeter?
Since there is a crossover on each side it pretty unlikely the problem is a speaker.
On the plot you posted the right channel tracks the left channel so left and right speakers are tracking. Left channel is ~5 dB low across the band. That looks like the problem is the input to the left speaker, so amplifier, cable, interconnect, preamp, source.
Have you tried switching cables, left to right? Switch at one place at a time. I would start at the source and switch left for right. (Be sure to turn everything off when you do. LOL) Then the preamp to amp and then the speaker wires, those to the crossover box and from it to the speakers. If the low speaker follows the change you have narrowed down the problem. If not it must be the left speaker.
Follow Ups:
Steve-
Thanks for you suggestions, all those diagnostics have been done. Definitely not upstream, the FR measurements were in fact made from the same amplifier channel, same source, etc.
The problem is in the left mid/tweeter panel, no question.
Best regards,
Mike
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