[grc] Sound Quality Issues

[Will Floyd]

Definitely sounds like a phase issue. Because of multiplexing that happens
at the fm processor, a phasing issue up the chain will cause some wacky
effects that are often less obvious to the ear. My recommendation would be
to listen to the source before it undergoes any processing. I'd bet the
culprit is a stereo balanced cable somewhere with one side mis-wired.

On Thu, Nov 10, 2016 at 3:26 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
>
>
>
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>


-- 
Will Floyd
Technical Director | Prometheus Radio Project
will at prometheusradio.org | 215.727.9620 x524