OK, so I recorded Leftover Salmon this past Tuesday in Durango. I again had the same spikes in the audio that I previously described above (though not nearly the same frequency of them occuring). I was running low gain/line in on the DR70 on all channels. I have the FP-24 calibrated correctly to -20dbfs with the Tascam.
The spikes only occur on the audio coming XLR line out of the FP-24 into channels 3/4 on the Tascam unit.
This morning I started running some additional tests trying to isolate the issue.
1.) I ran a dual XLR to 1/8" stereo cable Line Out of the FP-24 for an hour into channels 1/2 on the Tascam unit with absolutely no issue. So, I believe, this rules out the FP-24 output being the issue.
2.) I ran my Mics > XLR Cables directly into channels 3/4 on the Tascam using Phantom from the Tascam deck with no issue. So I know channels 3/4 XLR input on the Tascam works fine.
3.) I am currently running another test using the newest addition to my rig, Darktrain XLR interconnects, from XLR Line Out of FP-24 into channels 3/4 on Tascam Unit to see if the spikes are present. This is what I have done at the last couple shows when the spikes have been present. At this point, I am thinking it may be the interconnect cable since I ruled out the above tests.
EDIT: No static at home doing this third test either. I even jiggled the mic cables and interconnect cables around pretty good and could not reproduce the spikes. Once again I am at a total loss.
Can anyone else think of any other tests I could run in addition to the above?
I am thinking I will re-calibrate the gain on the Tascam unit to -18dbfs with the FP24 to see if I was somehow overloading the unit?
I dunno, I thought i would be able to replicate the problem but not maybe it is only being caused at higher dB levels found only at a live show?
?
Thanks for any input.