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Author Topic: need help troubleshooting mic issue  (Read 476 times)

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Offline KISSFAN

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need help troubleshooting mic issue
« on: September 17, 2022, 12:22:57 PM »
I use SP-CMC-8 mics > SP-SBSP1 battery box > Edirol R05.
i had this intermittent dropout problem back in December and contacted the dealer to help troubleshoot. dealer says "change the battery in the battery box". I am sure that is not the issue here, but I did anyway and, of course, the problem was gone. I have recorded more than 40 shows, changing the battery box 9v frequently (including yesterday I used a brand new battery). I am attaching a screenshot of the waveform as well as a sample of the sound of the dropouts.
The problem seems to happen a lot within in a few minutes, and then won't happen again for an hour or more.
Based on this info, is there a way to tell if I have a faulty battery box or if I need new/repaired mics?

Offline EmRR

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Re: need help troubleshooting mic issue
« Reply #1 on: September 17, 2022, 12:47:16 PM »
That sort of overwhelming transient does look like intermittent power, or some other similar intermittent fault, like a cold solder joint that acclimates and de-acclimates depending on conditions.  Cable....it's a big list of things.  Dying batteries don't do this, FWIW.  Anything you can do to rule out various parts of the chain, one at a time? 
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Offline beatkilla

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Re: need help troubleshooting mic issue
« Reply #2 on: September 17, 2022, 04:52:17 PM »
This sounds like a dirty connector or jostled(semi loose) input/output connector.

It's not at the mic capsule ends because both channels drop out.



I would clean all the minijacks with 91 percent isopropyl alcohol being careful not to get any on the plastic parts.

Do you have a good system of securing the cables entry and exits with some gaffer tape,rubber bands.velcro etc.?

« Last Edit: September 18, 2022, 05:05:30 PM by beatkilla »

Offline KISSFAN

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Re: need help troubleshooting mic issue
« Reply #3 on: September 18, 2022, 11:22:05 AM »
This sounds like a dirty connector or jostled(semi loose) input/output connector. thats sort of the direction I am leaning too

It's not at the mic capsule ends because both channels drop out. true, but it could be at the plug end of the mics, couldn't it?



I would clean all the minijacks with 91 percent isopropyl alcohol being careful not too get any on the plastic parts. will try that

Do you have a good system of securing the cables entry and exits with some gaffer tape,rubber bands.velcro etc.? I use a rubber band to secure the mic cable into the battery box

Offline KISSFAN

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Re: need help troubleshooting mic issue
« Reply #4 on: September 18, 2022, 11:31:32 AM »
Dying batteries don't do this, FWIW. I know. Sadly, I know all too well what dying batteries sound like (from experience), but I would have felt silly trying to tell the people at the mic company that wasn't the problem given my limited knowledge of the equipment- and then when the problem resolved, I was stuck at a dead end

Anything you can do to rule out various parts of the chain, one at a time? i was able to record last night using the mics without the battery box and plugging direct into the recorder and had no problems for the 2h15min recording. I am thinking it is an issue with the battery box, though I don't have any local friends with a loaner battery box to try to prove this. I will try Beatkilla's cleaning suggestion and contact the company to see if this is a repairable problem or if i am destined to buy a replacement box. i would have assumed that a dirty contact would act more like static than clunky dropouts that i would associate more with, like you said, loose soldered connections

Offline rigpimp

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Re: need help troubleshooting mic issue
« Reply #5 on: September 18, 2022, 02:55:34 PM »
Both channels so not a mic issue but likely a cable or stereo jack.  As previously noted these are pretty long transients at 0.5 sec - 1.0+ and in somewhat rapid succession.

I'd set this rig up in front of a stereo and put pieces apart one at a time to troubleshoot. 

Remove the mics and cable.  With the recorder on wiggle the cable at both ends noting which end first.  Mark that File A.  (any noise should simply be static from a loose end or jack)

If there is noise stop and replace the interconnect, and repeat the step above.  If no noise it is the cable, if there is noise it is a jack.

If there is no noise from the interconnect/jack tests above then add the mics and do the same thing (wiggle interconnect between BB and recorder, note which end first and call that file B. (this should have music only but if you are still getting dropouts you can swap interconnect and try again to rule out interconnect/jack)

Then try it by wiggling the mic cables only that way you can figure out which end the noise is from; mic to BB or BB to the recorder.

Hopefully, some of that makes sense.  Good luck


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Offline Gutbucket

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Re: need help troubleshooting mic issue
« Reply #6 on: September 19, 2022, 03:32:08 PM »
All good advice above.

Also a good idea to clean the battery contacts in the battery box while you are at it.
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