I was burning in a new AC cord overnight on my amp and in the morning I came downstairs and the ribbon tweeter on my Apogee Calipers was not working in the right channel. Bass panel was fine. So I tried to trace it back ...
- swapped interconnects L-R on the CD player - still there
- swapped speaker cables L-R - still there
So the issue is not upstream of the speaker. So I opened them up and played with a multi-meter...
- continuity from binding posts to the inside of the crossover
- continuity on each leg of the crossover to the ribbon
- continuity from one pole of the ribbin to the other pole of the ribbon
- continuity across the tweeter resistor
- no continuity across the 4 parallel crossover caps, but I can register capacitance across them
- continuity across the crossover coil
- with music playing I can read voltage getting to the ribbon and coming out of the ribbon
- tried tapping each crossover component, the ribbon, the wire, checked the solder connections, etc. All are fine and there is no crackle when tapped
I am totally baffled. By all accoounts I can't find a break in the circuit, but there's still no sound coming out of that ribbon tweeter.
Any and all ideas will be appreciated.
Thanks,
Bob