filtrete867
Member
I'm working on fixing up a disused audio rack for the auditorium speaker system at my school. No one has used that system in years so nobody knows anything about it. On the rack there is a 1U mixer with about 7 or so inputs and an aux in. The mixer does not use standard connectors but rather has +,-,G terminal strips for each input.
The aux in is currently a 3.5mm stereo cable with one end stripped and wired into the aux terminal strip. I was running some tests on it the other day and noticed something odd. When I played some regular music through the aux in, there was not a problem. However, when I fired up audacity and played back a 440 sine wave, there was no signal on the mixer. When I panned the sine wave to the left or right in audacity, the signal came back. I left that first sine wave panned to the left and then created another 440 sine wave, panned to the right and offset 180 degrees from the first. The signal was back and louder than before.
Upon some further investigation, I found that the ground wire for that terminal strip had been pulled out.
Any ideas?
The aux in is currently a 3.5mm stereo cable with one end stripped and wired into the aux terminal strip. I was running some tests on it the other day and noticed something odd. When I played some regular music through the aux in, there was not a problem. However, when I fired up audacity and played back a 440 sine wave, there was no signal on the mixer. When I panned the sine wave to the left or right in audacity, the signal came back. I left that first sine wave panned to the left and then created another 440 sine wave, panned to the right and offset 180 degrees from the first. The signal was back and louder than before.
Upon some further investigation, I found that the ground wire for that terminal strip had been pulled out.
Any ideas?