C70 mini XLR input level discrepancy

[MatthewR]

I'm having an issue with our C70 where when we're sourcing from two external microphones with one connected to the Ch.1 input and one to the Ch.2 input, the channel 1 input is about half the volume with all else being equal. While troubleshooting, I can take a single microphone, like our Rode NTG3, and move it and its XLR cable and XLR to XLR-mini adapter between the Ch.1 and Ch.2 input ports, with all external button and wheel settings, and all internal menu settings the same for both channels, and the Ch.1 input will be lower than Ch.2 by about half.

Troubleshooting I've tried:

• Confirmed both channels are on "Manual" (external A/M switch)
• Confirmed both channel level wheels are set to the same level (5)
• Confirmed both channels are set to "Mic +48v" to feed phantom power to the Rode NTG3
• Confirmed Ch1/Ch2 input set to "INPUT Terminals" in the menu
• Confirmed "Monitor Channels" set to "CH1/CH2" (even though the issue isn't just the monitored volume, the meter levels also reflect a Ch.1 level that is about half of what Ch.2 is showing)
• ALC link is set to separated
• Confirmed "Mic Trimming" and "Mic Attenuation" for both channels set to 0 and off.
• Confirmed "INPUT Limiter" set to off
• Switched "MIC Input" between "MIC" and "MIC (with power supply)" just to see if it made any difference (it didn't)
• Failing all that and getting frustrated, I updated firmware from 1.0.7.1 to 1.0.9.1. Didn't make a difference.
• I Ruled out any cable or mic issue by moving the same Mic, XLR cable, and XLR to XLR mini adapter between inputs. It all sounds as expected on the Ch.2 input, but about half the volume on Ch.1. But for good measure, I also tested other mics, XLR cables, and XLR to XLR mini adapters between the two inputs and always got the same results.

I fear I have some kind of hardware issue that's going to require sending this into Canon, but figured I'd ask here first.

[Hazel_T]

Hi MatthewR,

I'm sorry to hear you are experiencing audio level issues with your camera. Looking at your trouble shooting you already tried everything we would recommend for an issue like this. Since this is happening with multiple microphones and XLR cables that would indicate there is an issue with the camera itself.

There is one thing you could do just to double check. Try using ACL Link to link CH1 and CH2 to see if the same thing happens. With both of those channels linked the camera should force both inputs to use the exact same settings, so both should show the same audio levels. If there's still a difference when they are linked we would recommend sending the camera in for repair.

If you need to send the camera in for repair, the Canon U.S.A., Inc. online repair portal allows you to set up service in a few simple steps. The repair portal gives you the ability to set up service for multiple pieces of equipment at once, and to receive a repair estimate in the majority of cases, depending on your model and issue. The portal also allows you to upload images or videos that will assist us in repairing your product. You can also select how you wish to be notified of the progress of your repair. The portal's service history section allows you to view all services that have been performed on any of your camera or video products since January 7, 2020. 

Please follow the link below to access our online repair portal to arrange for service:

https://mycanon.usa.canon.com/signin

Instructions for Accessing and Using the Online Repair Portal

You will need to access or create your My Canon Account.

If you already have a My Canon Account and your product is already registered, simply click on the “Get Repair Services” link on the left menu and follow the onscreen instructions to arrange for service for your product.

If you have a My Canon Account and your product is not registered, you must register your product first. Click on the “Get Repair Services” link on the left menu, then click on the “Register Product” link on the right. After your product is registered, click on the “Get Repair Service” link on the left menu and follow the onscreen instructions to arrange for service for your product.

If you do not have a My Canon Account, you will need to create one. After you create your account, click on the “Add Product” link to register your first product. After your product is registered, click on the “Get Repair Service” link on the left menu and follow the onscreen instructions to arrange for service for your product. 

Once you have completed the repair request, you will have an opportunity to print a copy of the request for your records. This request form will also contain shipping instructions and an address label that you will attach to the outside of your shipping box when mailing your equipment for repair.