topic Re: C70 Noise on Input 1 & 2 in Professional Video

C70 Noise on Input 1 & 2

TeamPort — Tue, 19 Nov 2024 17:09:30 GMT

Hi there, I've recently acquired a C70 and been having trouble setting up audio. When I connect the mic (Sennheiser G4) via either of the mini-XLR inputs I get a steady static noise.

This happens even when nothing is plugged in so I don't think it can be the mic or the wire. My levels on the mic and the receiver are healthy. It's there when set to Mic or Mic with phantom power, it only stops when set to Line so I'm guessing it's some sort of internal pre-amp? I feel like I've been through every possible setting at this stage and can't figure out what the problem is so if this sounds familiar to anyone and you've found a fix I'd be really grateful to know! At the moment I'm just resorting to recording sound on the b-cam (R5, same mic going through the Tascam, no problems).

Re: C70 Noise on Input 1 & 2

John_Q — Thu, 21 Nov 2024 23:27:55 GMT

Hello TeamPort,

You would want to set corresponding INPUT 1/INPUT 2 audio source selection switch to simply MIC. Let's also verify that the correct input type has been selected. Select [MENU > Audio Setup > MIC Input]. Choose [MIC]. I reference that because you mention that this is happening even when nothing is connected to the camera. Lastly, let's see if adjusting the audio level helps. You can do that by setting the [Audio level switch] to M (manual) next to the appropriate channel being used. Then, turn the associated dial for that channel.

Re: C70 Noise on Input 1 & 2

SuperReel — Fri, 29 Nov 2024 17:04:12 GMT

Yes I get exactly the same, there is a pretty terrible noise floor on the C70 whatever I adjust, dials, inputs, menu settings. Even with nothing plugged in. I've recorded the same environment with the Zoom F3 as a control for room atmos, and there's no hiss. I think we're at the mercy of some bad pre-amps in the C70, unless some has a miracle up their sleeves.

Re: C70 Noise on Input 1 & 2

SuperReel — Fri, 23 Jan 2026 12:17:15 GMT

Update - I've upgraded to the C80, and will keep this post to this audio issue. The C80 handles audio so much more cleanly than the C70, the noise floor is minimal, and tests vs the Zoom are similar levels. I now don't need the Zoom. Whatever happened, the C80 audio is game-changing. (Unless I had a dodgy C70 previously)

Re: C70 Noise on Input 1 & 2

CharlesTeton — Tue, 27 Jan 2026 13:10:42 GMT

Not sure if it relevant to you but something I found out with C700 FF.

I'm assuming all Canon's 4K cameras have 4 tracks of audio. Whilst doing extensive test of my C700 FF, the audio came back with a very noisy background level. After a bit of problem solving, I whittled it down to the onboard scratch mics, if they were activated on 3/4 then there was a lot of background hiss but when disabled and channels 1&2 via XLR and 3/4 via minijack, everything was nice and clean. I personally disabled the scratch mic and have a shotgun for scratch/secondary audio.

Hope this helps? Charles