[grc] Sound Quality Issues

[David Klann]

Donna and al,

We did "wiggle" some of the wiring between the mics and the mixer, and
we reseated the connectors too. I hadn't considered cold solder joints.
After checking the phase and polarity of connections I'll add that to
the list of things to hunt down.

al, we *do* have electrically separate mic preamps. I'll be going
through all the cabling in the next few days to make sure things are as
they should be.

Thanks again everyone!

  ~d


On 11/10/2016 08:22 PM, Donna wrote:
> Could be a blown diaphragm or cable connection, or a cold solder that finally gave out. 
> 
>                    Donna DiBianco
>         Station Start-up Specialist
> 
>> On Nov 10, 2016, at 5:45 PM, Ken Freedman via grc <grc at maillist.peak.org> wrote:
>>
>> This most definitely sounds like a phase issue  the dead giveaway being
>> that the problem worsens when you put it into mono. Phase is when the
>> polarity of either the left or the right channel gets reversed so the left
>> and right channels either partially or completely cancel one another out.
>>
>> Common sources of things being out of phase are miswired jacks and cables.
>> Sometimes records and CDs also get manufactured out of phase. You can
>> analyze phase in many audio editing programs such as Pro Tools or Adobe
>> Audition. I am not sure if Audacity will measure phase or not. We use an
>> oscilloscope to read phase at FMU.
>>
>> -Ken
>>
>>
>> - Ken Freedman
>>
>>
>> ~~~~~~~~~~
>> Audience Engine / WFMU
>> PO Box 2011
>> Jersey City, NJ 07303-2011
>>
>> Contact Methods Ranked Best to Worst:
>>
>> ken at audienceengine.net
>> ken at wfmu.org
>>
>> @WFMU
>>
>> http://wfmu.org
>>
>> (201) 521-1416 ext 225
>> ~~~~~~~~~~~
>>
>>
>>
>>
>> On Thu, Nov 10, 2016 at 5:26 PM, David Klann via grc <grc at maillist.peak.org>
>> wrote:
>>
>>> Greetings Fellow Radio Geniuses!
>>>
>>> We're running into an audio quality issue here at WDRT 91.9fm in rural
>>> Western Wisconsin. I'm past the point of tearing my hair out in search
>>> of the root cause. I'll outline what I can here, and answer further
>>> questions as they come in. Thanks in advance for your thoughts and help
>>> diagnosing this.
>>>
>>> Some facts:
>>>
>>> - The quality of *some* (not all) spoken-word audio recorded in our
>>> "Studio B" sounds like it was recorded with the person speaking through
>>> "a metal pipe while in a tunnel" (that's the best description we've been
>>> able to come up with)
>>>
>>> - It *sometimes* depends on the radio people are listening to when it
>>> happens
>>>
>>> - Music recorded in the same studio from any source (analog vinyl, CD,
>>> digital source, etc) sounds just fine
>>>
>>> - One listener has noticed that it sounds "bad" when they listen with
>>> their home receiver set to "mono" mode, and when they switch to "stereo"
>>> mode it sounds fine
>>>
>>> - The same audio sent to our Internet stream *usually* sounds "normal",
>>> but sometimes sounds "bad"
>>>
>>> This has been an otherwise productive exercise for us because we've
>>> learned of a few other misconfigurations in our audio chain. But this
>>> one continues to haunt.
>>>
>>> Again, I appreciate any thoughts you can share, and will provide more
>>> info as requested. If off list, I'll summarize the "fix" to the list
>>> when we figure this out.
>>>
>>> Thanks!
>>>
>>>  ~David Klann
>>>   WDRT, 91.9fm, Viroqua, WI
>>>
>>>
>>>
>>> _______________________________________________
>>> grc mailing list
>>> grc at maillist.peak.org
>>> http://maillist.peak.org/mailman/listinfo/grc
>>>
>>>
>> _______________________________________________
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> 

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