I've been tinkering with my new (well, new to me) SR3 Advanced, and I was curious if anyone might be able to comment on something I noticed while testing the mags. Simply put, and contrary to what some might consider conventional wisdom, I'm noticing that the camera tends to run noisier with an empty mag attached compared to a mag that's loaded and threaded. In my tests with the mag loaded, I used about 40' of scrap film on a plastic core and was also using a plastic core on the take-up side.
It sounds like most of the additional noise with an empty mag is being generated from the camera's black main drive gear (just behind the inching knob). To help illustrate the differences I'm hearing, I've uploaded two audio clips - one of the camera running with an empty mag, and another of the camera running with a loaded and threaded mag. In both recordings, the camera was running at 24 FPS with the lens port cap intact, and the audio recorder (my iPhone) was about 8 or 9 inches away from the operator side of the camera. I performed the recordings in a completely silent room, so they may exaggerate the camera noise a little compared to working in an environment even with low ambient noise, but I thought this was the best way to capture the differences in sound. Take a listen...
In terms of low operating noise level, I think the camera sounds great with the loaded and threaded mag. Still, I'm just curious about the differences in sound with the empty vs. loaded mag, and if this is actually a common, typical observation for the SR3. It it a situation where the camera's main drive gear actually runs quieter with a load on the magazine's feed side vs. after a rollout?