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| Movies Forum Index » Movie Production (Sound) Forum » "hearbeatings" in my schoeps... |
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| Fred Salles... |
 Posted: Tue Oct 06, 2009 2:46 pm |
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Guest
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Hello,
Today heavy shoot in a very steep forest, my stereo setup (2xcmc6+mk4) in a
full rycote fell down the floor heavily.
The rycote got a little bump but mikes seemed fine althought half removed
from the clips.
Tey worked fine immediately after and through the day.
By the end of the day, during a take, one of the mikes started giving me
this worrying "heartbeatings", starting slow then accelerating, while the
mike still picking up sounds.
I unscrewed the mk4 and checked the contacts, then put it back in the
rycote, and it worked fine for the last takes...
I suspect a problem with a condenser failing in the cmc6 or miscontacted
after the schock.
I need to decide whether I should ask the producer for its insurance to pay
for repair.
not easy to convice as the mike seems to work fine now.
Anyone got the same experience and heard the same "heartbeat" sound could
give me some advice?
Thanks in advance
FredS |
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| G. John Garrett, CAS... |
| Posted: Tue Oct 06, 2009 7:42 pm |
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Guest
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Are you sure it wasn't just humidity? Take a toothpick and some alcohol to the
concentric connectors on the MK4 and CMCs. Just a little damp dirt in there
makes a helluva series resistor.
John
Fred Salles wrote:
Quote: Hello,
Today heavy shoot in a very steep forest, my stereo setup (2xcmc6+mk4) in a
full rycote fell down the floor heavily.
The rycote got a little bump but mikes seemed fine althought half removed
from the clips.
Tey worked fine immediately after and through the day.
By the end of the day, during a take, one of the mikes started giving me
this worrying "heartbeatings", starting slow then accelerating, while the
mike still picking up sounds.
I unscrewed the mk4 and checked the contacts, then put it back in the
rycote, and it worked fine for the last takes...
I suspect a problem with a condenser failing in the cmc6 or miscontacted
after the schock.
I need to decide whether I should ask the producer for its insurance to pay
for repair.
not easy to convice as the mike seems to work fine now.
Anyone got the same experience and heard the same "heartbeat" sound could
give me some advice?
Thanks in advance
FredS
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| jon chiles... |
| Posted: Thu Oct 08, 2009 4:22 am |
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What mixer were you using to power the mics?
I seem to remember an issue with impedence on some inputs where
motorboating would occur and engaging the low cut made it go away.
Still I could be way off as it was only happening to one of your mics
and not the other.
Email Bernhard Vollmer at (no spam) Schoeps, he should be able to shed some
light!
Good luck! |
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| Ty Ford |
| Posted: Thu Oct 08, 2009 5:50 am |
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Joined: 07 Jan 2005
Posts: 903
Location: Baltimore, MD
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On Wed, 7 Oct 2009 03:54:07 -0400, Fred Salles wrote
(in article <4acc4925$0$1425$426a74cc at (no spam) news.free.fr>):
Quote: Hi all,
no humidity involved here.
I am in south of France and it was a windy day.
Besides, I did listen to some schoeps (not mines , older ones) beeing
afected by humidity. it is a completely different sound. More issy.
The noises i had were low freq pulses, excactely like an accelerating
heartbeat. At first i though it was me having problem in my hear, just
before checking the meters...
THanks,
FredS
"Paul Paragon" <pparagon at (no spam) gmail.com> a écrit dans le message de news:
bbef76a8-cc8b-4d3e-8714-e7fb2db4e6a6 at (no spam) b18g2000vbl.googlegroups.com...
What was the humidity like? It sounds very much like damp problems.
Taking apart the mic gave it enough time to dry out. If there was
some condensation on the mic body this could have been dislodged into
the capsule / electronics during the fall.
Tip, use sennheisers in high humidity.
Paul
I have only had my two cmc641 make noises twice. Both times, cleaning the
capsule and PS contacts eliminated the problem. I leave the capsules screwed
on now.
Regards,
Ty Ford
--Audio Equipment Reviews Audio Production Services
Acting and Voiceover Demos http://www.tyford.com
Guitar player?:http://www.youtube.com/watch?v=yWaPRHMGhGA |
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| ben lowry... |
| Posted: Thu Oct 08, 2009 11:17 am |
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Guest
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If you were using wireless boom: a Lectro um400a can add a thumping
heartbeat sound as its battery dies, while the on-mic audio sounds
thin.
ben lowry |
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| Fred Salles... |
| Posted: Thu Oct 08, 2009 11:47 am |
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Guest
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I was using a SQN4S serie 4e,
but as you said only one mike out of 2 got this.
Thanks for the contact at Schoeps , i 'll email him.
An electroncian friend of mine confirmed me that this kind of noise, low
freq beating, usually means a capacitor discharging.
As it occurs only once, he suggests that one capa might have been sligthly
desolded for a moment with the schok.
Thanks
Freds
"jon chiles" <afroaudio at (no spam) gmail.com> a écrit dans le message de news:
8b912baf-3413-44f7-b693-f547a779905b at (no spam) j28g2000vbl.googlegroups.com...
Quote: What mixer were you using to power the mics?
I seem to remember an issue with impedence on some inputs where
motorboating would occur and engaging the low cut made it go away.
Still I could be way off as it was only happening to one of your mics
and not the other.
Email Bernhard Vollmer at (no spam) Schoeps, he should be able to shed some
light!
Good luck! |
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| PR... |
| Posted: Sat Oct 10, 2009 5:22 am |
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On Oct 6, 5:46 pm, "Fred Salles" <fred4tu... at (no spam) STOPSPAM-free.fr> wrote:
Quote: Hello,
Today heavy shoot in a very steep forest, my stereo setup (2xcmc6+mk4) in a
full rycote fell down the floor heavily.
The rycote got a little bump but mikes seemed fine althought half removed
from the clips.
Tey worked fine immediately after and through the day.
By the end of the day, during a take, one of the mikes started giving me
this worrying "heartbeatings", starting slow then accelerating, while the
mike still picking up sounds.
I unscrewed the mk4 and checked the contacts, then put it back in the
rycote, and it worked fine for the last takes...
I suspect a problem with a condenser failing in the cmc6 or miscontacted
after the schock.
I need to decide whether I should ask the producer for its insurance to pay
for repair.
not easy to convice as the mike seems to work fine now.
Anyone got the same experience and heard the same "heartbeat" sound could
give me some advice?
Thanks in advance
FredS
Fred,
I have 2 CMC5 w/ MK41 and I think you had a humidity problem. I use to
work in rain forest and sometimes it happens with Schoeps mics. But
humidity afects only the capsules. One of my MK41 is more sensitive to
humidity to the other capsule, even if I change the CMC. Have always
by your side a hair dryer. If you warm the capsule a little bit, the
problem is solved. When you are not using the mic, keep it inside the
case. And when you are going to sleep be sure to keep mics, mixer and
recorder in sealed dry room. Those are the tips I learned shooting in
Amazon forest. I hope it will help you.
Regards,
Paulo |
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| Soundiego... |
| Posted: Sun Nov 01, 2009 4:27 pm |
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Guest
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If happened once to me many years ago with a 416 and a Shure mixer. It
was just like you say, a regular very low freq heartbeat. At first I
blamed on the lavs but it turned out to be the mixer. Even with the
boom unpluged it would beat. It was so low that I didn't care. The mic
didn't do it again (I still own it) but don't know the mixer since it
was not mine. |
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