I tested it with Sony DSLR a560. Without the battery I can hear a sound
like a working motor (quiet though), but I did not mount it on the
camera, besides, the camera was recording at memory stick not on a HDD
or like that. My guess, that this was an EM interference. Without
battery there was mono recording - no matter what side from I would
speak, the sound was on the middle in the playback. With battery in, the
interference was 99% gone, but hiss is appear. Not much, but I can tell
the difference in the quiet room or if you playing back through
headphones, and - yes, there is stereo. When I compared the sound with
battery out to the sound with battery in, the last one was more clear
and a little bit louder. With the battery out, at the same distance from
microphone (about 1 yard), the sound was like the battery was dieing:
vibrating, more quiet and unclear. The camera battery was at 74% - more
than enough to power a microphone.
Of cause it might be the camera
itself. But camera manual says that external microphone will be powered
by camera. Well, and it does, but microphone in any way should record
the stereo. But stereo recording works with battery in only. I wrote
about this issue to Audio-Technica. Here is what they answered:
"Although
the microphone will operate using plug-in power, we recommend using
battery power for optimal performance. There are no standards for
plug-in power, so the voltage varies by device, resulting in
inconsistent performance. This does not explain the mono recording
issues; I have not had any reports of this. I recommend simply replacing
the battery before important shoots; LR44 batteries are available at
most drug stores, etc. and are fairly inexpensive."
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