[arm-allstar] Best Audio Through IAXRPT?

David Andrzejewski david at davidandrzejewski.com
Wed Aug 19 11:24:00 EDT 2020


I am most definitely not an audio engineer, and I'm lazy, so I use a 
dynamic mic - Shure SM58 - which has the effect of reducing background 
noise.  I run it into a Behringer interface.  Relatively low gain, so I 
have to get pretty close to the mic, but that keeps background noise 
about as low as I can get it without running it through a DAW (and my 
DAW of choice, by the way, is also Reaper, nice to know that the pros 
use it too).  In fact, background noise (from all the other junk in my 
office/shack) is the reason I don't use my AT2020 for this.

I've never thought about compression, it's probably a good idea. The 
analog repeaters I'm responsible for actually do some compression 
already to make up for differences in users' audio levels.

Also, don't forget that your audio is converted to G711 u-Law at a 
relatively low (by pro audio standards at least) bitrate.

- Dave/ad8g

On 2020-08-18 13:50, "Chris Smart via ARM-allstar" wrote:
> Hi.
> 
> 
> I'm trying to adjust my brain and ears from the pro audio world to the
> ham radio "communications audio" world.  Basically, I'm used to
> wanting things to be flat, and now need them more trebly, but not
> peaky or sharp coming out of tiny HT speakers.
> 
> 
> For those of you using a decent studio mic into IAXRPT, what's your
> processing chain like?
> 
> 
> So far, I'm running:
> 
> 
> Rode NT1A > RME interface (adding some EQ, a broad 3dB peak around
> 1.5K and another around 3K) > into Reaper, where I'm getting rid of
> background noise, compressing with threshold -11dB, Ratio 5:1, 10MS
> Attack/250MS release > final output reduced -3.5dB so it doesn't peak
> when transcoded from Allstar to other modes. Reaper's output goes via
> Virtual Audio Cable into IAXRPT.
> 
> 
> Chris
> 
> 
> 
> 
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