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Author Topic: What is going on here?  (Read 7772 times)

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Offline vwmule

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What is going on here?
« on: November 07, 2017, 12:13:29 PM »
I recorded Oteil and Friends last night in Silver Spring, Md., outside Washington. Strong performance and the sound was probably the best I've heard at the Fillmore, no doubt helped by venue allowing us to set up DFC rather than off to the side of board as is standard.

Yet listening to the recording reveals some really strange, annoying sound fluctuations. The volume will suddenly increase or decrease, giving a sorta "wavy" feel to certain passages. It's a bear to listen to.

A good example is Bertha: https://archive.org/details/oteil2017-11-06/oteil2017-11-06.vwmule.t14.flac

I cannot figure out what is up.

- Doesn't seem to be a loose cable; I inspected L and R channels and the fluctuation is present in each.
- The recorder settings were not changed, though before the show I upgraded to the latest MixPre firmware.
- I noticed some swaying of the stand when the audience started dancing, but nothing extreme. Could it be phasing? If so, I've never experienced anything like that.
- Could it be the venue PA? I didn't notice it at the show.

I'd appreciate any observations, thoughts you might have.
« Last Edit: November 07, 2017, 12:48:59 PM by vwmule »

Offline lsd2525

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Re: What is going on here?
« Reply #1 on: November 07, 2017, 12:23:05 PM »
Paging Gordon. He reported similar issues with his Mix Pre at NMAS the other night. Not sure if he got it sorted out.
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Offline IMPigpen

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Re: What is going on here?
« Reply #2 on: November 07, 2017, 12:34:34 PM »
I listened to the Bertha from your source and also the AKG C1000 source on archive and it's not a venue/PA issue since it's not present on the other source.  Very weird....
Mics: Neumann KM184s; ADK TLs; Naiant X-R omnis & cards; MM-BSM-7M omnis
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Offline vwmule

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Re: What is going on here?
« Reply #3 on: November 07, 2017, 12:41:54 PM »
Thanks. I was waiting to compare with another source and hadn't seen that one.

You're right; it's not a venue thing.
« Last Edit: November 07, 2017, 12:50:01 PM by vwmule »

Offline Gutbucket

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Re: What is going on here?
« Reply #4 on: November 07, 2017, 12:55:53 PM »
Hey Alex, I suspect an issue with the Mixpre.  Maybe phantom power fluctuations.  It's not unlike the problem I and other folks were occasionally having a few years back with the Tascam DR-680, generally thought to be related to powering/overheating.  That firmware update is suspect to my way of thinking.

Bummer.  That recording sounds great otherwise.
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Offline vwmule

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Re: What is going on here?
« Reply #5 on: November 07, 2017, 01:12:59 PM »
Total bummer (I'm going to have the recording removed but wanted to allow others to inspect). I'll go back to the older firmware, which I had no issues with.

Any other thoughts?
« Last Edit: November 07, 2017, 01:18:13 PM by vwmule »

Offline dallman

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Re: What is going on here?
« Reply #6 on: November 07, 2017, 01:36:03 PM »
Total bummer (I'm going to have the recording removed but wanted to allow others to inspect). I'll go back to the older firmware, which I had no issues with.

Any other thoughts?
I would contact Sound Devices . They are always actively involved and quick to respond. I am sure they would want to address an issue like this immediately.
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Offline Gordon

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Re: What is going on here?
« Reply #7 on: November 07, 2017, 01:40:26 PM »
Exact same issues with both mine and jbells the other night! I'm out and about now but can post samples later when I get home. Gotta be firmware. I was thinking maybe channel linking but who knows. Where your channels linked?
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Offline Gordon

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Re: What is going on here?
« Reply #8 on: November 07, 2017, 01:42:07 PM »
Total bummer (I'm going to have the recording removed but wanted to allow others to inspect). I'll go back to the older firmware, which I had no issues with.

Any other thoughts?

Fwi I painstakingly edited mine and it's not too bad but it took a while!  I sent Paul from SD a pm about it this morning.
Microtech Gefell M20 or M21 > Nbob actives > Naiant PFA > Sound Devices MixPre-6 II @ 32/48

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Offline vwmule

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Re: What is going on here?
« Reply #9 on: November 07, 2017, 01:54:43 PM »
> Exact same issues with both mine and jbells the other night! I'm out and about now but can post samples later when I get home. Gotta be firmware.

Were you using the latest firmware?

My settings show linked.

Offline dallman

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Re: What is going on here?
« Reply #10 on: November 07, 2017, 01:56:21 PM »
Exact same issues with both mine and jbells the other night! I'm out and about now but can post samples later when I get home. Gotta be firmware. I was thinking maybe channel linking but who knows. Where your channels linked?
This could be an (the) issue. I unlinked my channels just before a show because I didn't like the way the meters looked. I was running the new firmware, and had no issues after. That does not prove anything, but it is a possibility unless others having the issue were not linked.
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Offline willndmb

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Re: What is going on here?
« Reply #11 on: November 07, 2017, 02:23:37 PM »
Are you guys using "proper powering"?
I.e. Green light and not orange
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Offline rippleish20

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Re: What is going on here?
« Reply #12 on: November 07, 2017, 02:30:48 PM »
I recorded several shows in the last week and did not have this particular problem (I did have a strange issue one night where is decided it couldnt see my sd card when I hit record but..). I did not upgrade from 1.11 however ...
« Last Edit: November 07, 2017, 02:57:54 PM by rippleish20 »
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Offline vwmule

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Re: What is going on here?
« Reply #13 on: November 07, 2017, 02:35:07 PM »
> Are you guys using "proper powering"?

Mine is green, always has been.

Offline vwmule

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Re: What is going on here?
« Reply #14 on: November 07, 2017, 02:52:03 PM »
As it happens, I'm seeing Oteil tomorrow in Baltimore and will run the MP6 with the previous firmware. Will also run mics into Zoom F8.

 

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