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Topics - cudak888

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Forgive me if this has been asked before, but after 5 hours of searching, I have yet to find a current answer:

I am trying to figure out some method of monitoring audio from the EOS-M while retaining LiveView. The FAQ states that the Digital A/V-to-RCA output is not supported on the M.

Hence, I've been trying to find out whether either Magic or Tragic Lantern's most recent build will allow for Live View functionality when connected via HDMI to a monitor. My Sony field/studio monitor has an audio-out jack from which I can monitor the EOS-M, but it'd be nice to have the touchscreen settings to allow for adjustment without cycling through multiple menus.


EDIT: Turns out to be an oddity with the BeachTek DXA-SLR; has nothing to do with ML; hence my marking it as solved. Granted, there remains a question about the preamp, for which I'm waiting for a reply from Harry at BeachTek, but for those curious as to a perfect workaround, read on.

I've been Googling about and tearing through the archives here at the ML forum to no avail (though one user in the audio sticky did seem to suggest a similar issue) hence, I am posting my specific quandary:

I'm presently running a Canon 5D Mark II with Magic Lantern. I also have a BeachTek DXA-SLR which I use in conjunction with it, but have had some difficulty attaining good audio levels without running the BeachTek's with the preamp gain on the "HI" setting (15db gain), and the trim controls around ~7 or ~8. Goes for both my cheapo Audio Technica battery-powered lavalier mics, and my phantom-powered Rode NTG2.

I was led to believe it was a problem with the BeachTek, but it isn't. I plugged the BeachTek directly into my computer and monitored its audio levels. As I thought, the BeachTek's preamps are putting out enough range that I can easily go straight past -6db and peak way past 0db if I jack up the trim controls even close to full. The green lamps on the BeachTek correlate this.

Therefore, it would seem logical that if I run the 5DM2 with ML set to 0db of analog gain (and 0db digital, obviously), and AGC off, I should get roughly (granted, 44.1kHz, but adequate in its own right) the same levels as the aforementioned good output from the BeachTek.

Problem is, I have to run Magic Lantern with a full 32db of analog gain (no digital gain, AGC turned off) to get roughly the same audio level as I hear clear from the BeachTek. It doesn't make sense, and introduces the hiss-prone preamps in the 5D which we're all trying to get away from to begin with.

For the sake of curiosity, I went back to 0db of analog gain and split the output from the BeachTek to both the computer and the camera. Whatever value was recorded by Audacity from the BeachTek output was recorded by the camera at a level roughly 20dB lower (-18db from the BeachTek becomes -38 in the camera). With the headphones on the BeachTek, I could jump from monitoring the XLR signal directly from the BeachTek, and jump to the A/V-to-RCA signal directly from the camera and hear the reduction in gain, live.

I realize the camera is limited to recording in 16bit 44.1kHz, but that doesn't explain the wild difference in volume.

I highly doubt that I've missed anything, for I've been up and down the settings, the manual, and the forum (both ML's forum and everyone else on Google) quite a few times.

I figured now is the time to ask the experts. I'm not sure if I've found a problem or not.

Many thanks for any help that can be provided.


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