Become a Site Supporter and Never see Ads again!

Author Topic: Trying to figure out what caused these intermittent spikes/pops  (Read 1042 times)

0 Members and 1 Guest are viewing this topic.

Offline 108 Ohms

  • Auspicious, Ain't It ?
  • Trade Count: (0)
  • Needs to get out more...
  • *****
  • Posts: 8799
  • Gender: Male
  • Waiting on the next cladogenetic event...
    • Oceana North America
Re: Trying to figure out what caused these intermittent spikes/pops
« Reply #15 on: May 03, 2017, 05:52:54 PM »
Cables and connectors are # 1  likely cause, of course.

Don't discount electrical noise from cell phones, fluorescent lighting, air handlers, blowers, electric doors, subways, golf carts, alien craft, etc.
Close walk-bys with nylon clothing can create static pops as well. 
Don't let gals in spandex swing on your mic pole.          (was going to make this gender inclusive, but wasn't sure how to word it)
« Last Edit: May 03, 2017, 05:55:02 PM by 108 Ohms »
"Peace is for everyone"
        - Norah Jones


Offline billydee

  • Trade Count: (7)
  • Taperssection Member
  • ***
  • Posts: 563
  • Gender: Male
Re: Trying to figure out what caused these intermittent spikes/pops
« Reply #16 on: May 04, 2017, 04:35:17 PM »
I'll have a chance tonight to at least find out if it was the mics causing the problem. I'll be running sbd/aud for the Black Lillies and be using different cables, running battery power and be using the DR-60.

Offline morst

  • Archivist: Camper Van Beethoven & Cracker
  • Trade Count: (1)
  • Needs to get out more...
  • *****
  • Posts: 2270
  • Get in touch if you wanna record Cracker or CVB!
    • Soundscape Preservation Society
Re: Trying to figure out what caused these intermittent spikes/pops
« Reply #17 on: May 05, 2017, 10:00:02 AM »
Don't let folks in spandex swing on your mic pole.          (was going to make this gender inclusive, but wasn't sure how to word it)

FTFY^^
Teams: Neumann, Bay Area Tapers, Multitrack, Pioneertown Tapers, Mac Geeks, Cassette Masters, Poster Collectors, Alumni of teams St Louis, Upper Midwest & Milwaukee / Southern Wisco

Offline 108 Ohms

  • Auspicious, Ain't It ?
  • Trade Count: (0)
  • Needs to get out more...
  • *****
  • Posts: 8799
  • Gender: Male
  • Waiting on the next cladogenetic event...
    • Oceana North America
Re: Trying to figure out what caused these intermittent spikes/pops
« Reply #18 on: May 05, 2017, 06:42:05 PM »
Don't let folks in spandex swing on your mic pole.          (was going to make this gender inclusive, but wasn't sure how to word it)

FTFY^^

Well that was too easy!   Thanks
I grew up in the days of typewriters, "gals from the office", and telephones which had rotary, spring-loaded dials.
TVs were black & white, and the cassette tape, even 8-Track, had not been invented yet.
"Peace is for everyone"
        - Norah Jones


Offline billydee

  • Trade Count: (7)
  • Taperssection Member
  • ***
  • Posts: 563
  • Gender: Male
Re: Trying to figure out what caused these intermittent spikes/pops
« Reply #19 on: May 06, 2017, 11:28:51 AM »
I'll have a chance tonight to at least find out if it was the mics causing the problem. I'll be running sbd/aud for the Black Lillies and be using different cables, running battery power and be using the DR-60.
Well, in a 2hr and 15 min recording there was one "spike", about 90 mins in. Different deck, different cables, different power, different venue, same SD card and same mics.  :shrug:

But I did get an approved card (for the DR-70D) finally so I'll be using that recorder next time out.

Offline jbell

  • TDS
  • Trade Count: (129)
  • Needs to get out more...
  • *****
  • Posts: 3757
  • Gender: Male
  • Spreadicated
Re: Trying to figure out what caused these intermittent spikes/pops
« Reply #20 on: May 10, 2017, 09:50:31 AM »
What mics??  Sounds like they could be the problem.
Schoeps MK4's, MK41's> KCY 250/5 Ig> Schoeps VMS 5U> Sony PCM-M10

Offline Life In Rewind

  • Trade Count: (0)
  • Taperssection Member
  • ***
  • Posts: 821
Re: Trying to figure out what caused these intermittent spikes/pops
« Reply #21 on: May 10, 2017, 11:04:27 AM »
Its a DR-70D - Gotta be the card - here's the thing - the corruption can happen with sets that were fine.

Example - Using an unapproved card - I recorded one show - and it was fine.

I recorded another show and it had spikes - and then - the previous show also had spikes that weren't there before.

And then the card failed wouldn't work in camera - so I think the unapproved cards can not only make bad recordings - but they also can get screwed up in the 70D.
Audix M1280/Avantone CK-1/APEX 435/Altec 626A/TEAC ME-120/Sony ECM-999PR/Sony ECM-MS5
TASCAM DR-70D/Tricorder

Offline billydee

  • Trade Count: (7)
  • Taperssection Member
  • ***
  • Posts: 563
  • Gender: Male
Re: Trying to figure out what caused these intermittent spikes/pops
« Reply #22 on: May 10, 2017, 12:37:24 PM »
What mics??  Sounds like they could be the problem.
The mics are phantom power modded Teac ME-120's (essentially Nak CM300 clones).

I asked the person that did the mod and based on what they know and the spike samples I sent, they suggested the spikes could be caused by environmental noise, i.e., EMI picked up on the cable and that the spikes are completely untypical of a bad jfet or capsule.

He also suggested that to be sure I do an equally set up test in the same venue using one of the phantom modded mics and a similar battery powered mic. I do have a pair of the same mics that were not phantom power modded, but the chances of running a test like that in the same venue in the near future is nearly impossible for various reasons.

One thing I did not mention in the last recording update is that I did use one of the same "not-approved" SD cards in the Black Lillies DR-60 recording, and that same card had been used in the DR-70 recordings with multiple spikes. And I think this gets to the most recent point made by Life in Rewind.

Offline rumbleseat

  • Trade Count: (0)
  • Taperssection Newbie
  • *
  • Posts: 28
  • Gender: Male
Re: Trying to figure out what caused these intermittent spikes/pops
« Reply #23 on: May 13, 2017, 12:26:47 PM »
This is a taper's worst nightmare.  I feel your pain!

I suggest trying to take EMI interference out of the list of possible culprits.

Neutrik makes and XLR connectors that "eliminate" EMI on the cable.  You only need one connector on the cable - at either end.
Most put the EMC connector on the Male end - the end that attaches to your recorder/preamp.

The downside is that these connectors are pricey and more difficult to solder and install than standard Neutrik XX connectors.

http://www.neutrik.com/en/xlr/emc-series/nc3mxx-emc
« Last Edit: May 13, 2017, 12:29:17 PM by rumbleseat »
Church Audio CAFS and CA-11 cards > Naiant PFA Low Noise > Canare L-4E6S with Neutrik EMC > Tascam DR-680 MKII > memories

 

RSS | Mobile
Page created in 0.149 seconds with 31 queries.
© 2002-2017 Taperssection.com
Powered by SMF
Website Design by Foxtrot Media, Inc., a Baltimore Website Company