Panasonic has announced a fix for the audio buzz. Please click HERE for the full story.
UPDATE May 27th.
B&H today had a webcast on the GH4 with Panasonic Field Training Manager Mathew Frazer. I asked about the issue through the twitter feed with the hashtag #BHPhotoLive to see if I could get a response. Well I did! Here is what Mathew says is the problem. In the B&H GH4 Webcast go to 1:46:00 by clicking on the progress bar. He starts about a minute after from that point and you can see Mathews explanation of what might be happening.
Mathew says they are still looking into ways to fix the issue when not using the Panasonic shotgun microphone.
Mathew Frazer says The problem is with the 3.5 mini connector. The GH4 is designed to work with the Panasonic DMW-MS2 Stereo Shotgun Microphone and has features that can be adjusted in the menu of the GH4. In order to have these features the mic uses this type of connector. The pattern goes as follows. TIP-RING-RING-SLEEVE
Most 3.5 mini connectors use. TIP-RING-SLEEVE.
He says this is causing a ground issue when not using the Panasonic Shotgun microphone. He stated that maybe an adapter will solve the problem but that Panasonic engineers are still looking into it. So thats the update and I’m sure more info will be coming soon in the meantime anyone know were to get an adapter like this? Well it turns out it’s pretty simple. It’s a TRRS to TRS adapter. I ordered this one and will give it try.
UPDATE May 29th.
I received the TRS to TRRS adapter cable and it still has the issue. Unfortunately we will have to wait until Panasonic engineers can figure out how to solve the problem with some microphones like the Rode VideoMic Pro. Sorry. I wish this would have worked.
I decided to give it one more go. I ordered the Rode SC4 3.5 TRS to TRRS adapter I doubt this is going to make a difference but since it’s made by Rode I know for sure the adapter is what it says it is. I tried the Rode SC4 with no luck. In fact the adapter doesn’t work at all with the VideoMic Pro. No signal passes through. It is designed to be used with an iPhone so possibly the pin assignment is different.
I finally was able to duplicate the issue with my GH4. But in order to do so I had to use the RODE VideoMic Pro. My Rode Lavalier doesn’t make the clicking buzz issue. Thats the good news. Below is what the buzz sounds like. In order to make it easier to hear without cranking the audio up on your system I triple tracked it in Premiere Pro and boosted all three tracks up 6db. It doesn’t sound this bad or load but i want to hear what it does sound like.
The other good news is if you set the Rode to 0db and the GH4 to around -12db the issue seems to go away or at least not be audible. This could be considered the work around for that mic. The key here is to avoid bringing the GH4 audio setting above -12db. You can go a click up and still be fine but the higher you push the GH3 the more noise you bring in and in general that has been the rule for all DSLR’s. I’m talking about the normal kind of noise here not the clicking buzz issue.
This is a test I did for the RODE Lavalier and the GH4. Dont really focus on what I’m talking about because this test was for a review of the Rode Lavalier I did. The camera was set to -12db and I got a very good level for recording. Right after I stop talking you will hear :20 worth of silence. I boosted the audio in post to +6db to make it more pronounced. Go ahead and crank up your speakers but…..
TURN YOUR VOLUME DOWN BEFORE :20 IS UP
As you can hear no issue with the Rode Lavalier. Now this isn’t a fix because not everybody has the Rode Lavalier and if you need a shotgun mic then a lav wont due, but I think we can at least look to it and see what makes it work and hopefully that will help fix the problem. I sure hope Panasonic can fix this with some kind of firmware update because it’s not fair to the consumer that only a few microphones will work and if Panasonic’s mics are the only solution they are offering to deal with this thats also not acceptable.
Here is the specs of the Rode Lavalier.
|Acoustic Principle||Pressure Gradient|
|Active Electronics||JFET impedance converter|
|Frequency Range||60Hz – 18kHz|
|Maximum SPL||110dB SPL (@ 1kHz, 1% THD into 1KΩ load)|
|Maximum Output Level||189.0mV (@ 1kHz, 1% THD into 1KΩ load)|
|Sensitivity||-33.5dB re 1 Volt/Pascal (21.00mV @ 94 dB SPL) +/- 2 dB @ 1kHz|
|Equivalent Noise Level (A-weighted)||25dB-A|
|Dimensions||12.00mmH x 4.50mmW x 4.50mmD|
|Dimensions||12.00mmH x 4.50mmW x 4.50mmD|
I’m not a super engineer so if you are please dig in.
would really appreciate it if you have tested your GH4 and found other mics that do work with no issues please leave the brand and model in the comments section. This will help us determine what is usable until we find or get a fix from Panasonic.
If I find out more I will update this post. I hope I helped or at least give some kind of workaround for you.
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