Recently I was recording a PASS device (Personal Alert Safety System) that is used in a firefighters SCBA (self-contained breathing apparatus). Using motion it alerts when a firefighter may be in trouble. It emits a very loud and high pitched series of sounds.
Most of my recordings are clean except for in a couple parts of the devices alerts.
I'm curious if more experienced ears can recognize the cause of this distortion. Is it my microphone or maybe the pre-amp on my recorder?
Signal flow is a Rode NTG-2 into a Marantz PMD661. I also recorded it with a Sony M10, and that came out clean.
I'm guessing that the mics condenser couldn't handle the frequency at such a high SPL.
Other notes: I was positioned apx 10-12 feet away from the PASS device (M10 was about 8-10ft away). The Marantz input never peaked. It's meter went no higher then -6db. Also the sample linked was recorded in a live burn building, with metal walls concrete floor and wood barriers hanging about.
Would like to know your thoughts. Thank You.