I’ve had a look, first thing you need to do is to make sure SIRI is enabled 
before you start Tweaking settings.
Next is to ensure that SIRI is using your USB microphone and this will be found 
in the selection box.

> On 21 Mar 2017, at 10:12 am, Gary Schindler <garys5...@comcast.net> wrote:
> 
> I shall have to do that. I haven't had Sierra that long, so I have a lot to 
> learn about how Siri in general works on the Mac with respect to audio.
> 
> 
> -----Original Message----- From: Dane Trethowan
> Sent: Monday, March 20, 2017 4:56 PM
> To: PC Audio Discussion List
> Subject: Re: sound input on the mac mini
> 
> I You'll probably need to Tweak the Siri preferences under system
> Preferences.
> 
> I've never used SIRI on my Mac machine, just one of the million and one
> things I've been meaning to do but haven't got around to doing.
> 
> 
> 
> On 21/03/2017 7:53 AM, Gary Schindler wrote:
>> I have one of the 2012 machines, and if I plug in a USB microphone for Siri, 
>> will Siri recognize it right away or do I have to go into some settings to 
>> select the microphone?
>> 
>> 
>> -----Original Message----- From: Dane Trethowan
>> Sent: Monday, March 20, 2017 4:24 PM
>> To: PC Audio Discussion List
>> Subject: Re: sound input on the mac mini
>> 
>> I hope he's able to enjoy his Mac Mini as much as I do, certainly one of
>> the best ever computing devices I've ever purchased.
>> 
>> I've spoken about the Mac Mini before here - in audio terms - so I won't
>> go on about it again.
>> 
>> If your friend has the Late 2012 Mac Mini then he truly has a treasure
>> box which was ahead of its time.
>> 
>> They hold their value well too on the second-hand market mainly because
>> - for whatever reason - Apple have decided to downgrade thus cheapen the
>> later Mac Mini machines.
>> 
>> 
>> 
>> On 21/03/2017 6:22 AM, André van Deventer wrote:
>>> Thanx dane - will forward this to him.
>>> 
>>> It's one of those headsets with a plug for the microphone and a plug for the
>>> headphone part.
>>> Of course if the socket does nothave enough power then he will have to take
>>> the other route.
>>> 
>>> André
>>> 
>>> -----Original Message-----
>>> From: Pc-audio [mailto:pc-audio-boun...@pc-audio.org] On Behalf Of Dane
>>> Trethowan
>>> Sent: Monday, March 20, 2017 9:18 PM
>>> To: PC Audio Discussion List
>>> Subject: Re: sound input on the mac mini
>>> 
>>> Hi!
>>> 
>>> Yes, the input socket is a line-in standard and - unlike some Windows sound
>>> cards - doesn't provide power either so you have some alternatives at your
>>> disposal, I'll give you a link with more details at the bottom of this
>>> eMail.
>>> 
>>> A microphone can be used with this socket but it needs to be of the battery
>>> powered kind - in other words the microphone has to provide amplification.
>>> 
>>> On the Mac Mini a microphone is usually connected via the output socket
>>> believe it or not.
>>> 
>>> This doesn't make sense when you read it but when you think about it
>>> connecting a microphone to the output socket makes perfect sense.
>>> 
>>> Suppose you have a set of Apple Earbuds or compatible headset with an inline
>>> microphone or similar, all you have to do is to plug the headset into the
>>> line-out/headphones socket and you have both your headphones and microphone
>>> there.
>>> 
>>> I know that various adapters are available for this socket including one
>>> which will allow the oconnection of the conventional two plug stereo headset
>>> - one plug being for the headphones themselves and the other being for the
>>> microphone on the headset -.
>>> 
>>> Some more information about the audio in and out on the Mac Mini before we
>>> move on.
>>> 
>>> Both these jacks are capable of accepting digital signals which is handy to
>>> know if you're connecting to speakers with a digital input, connecting to a
>>> source such as a TV or similar for recording from a digital output and so
>>> on.
>>> 
>>> Now if the microphone situation with the audio in and out sockets is just
>>> far too annoying then the easiest way to get around all this is to use one
>>> of the USB sockets for either a dedicated USB microphone or - perhaps a
>>> better option in your firneds case - a USB adapter.
>>> 
>>> This adapter is affectively a USB Sound Card dongle which provides the
>>> connections for a powered microphone - standard Windows PC type - or other
>>> microphone so you'll have to do a little research here into what's
>>> available.
>>> 
>>> So here ends my explanation and I hope you followed along <smile> and here's
>>> the support link from the Apple site.
>>> 
>>> https://discussions.apple.com/thread/3331295?start=0
>>> On 21/03/2017 5:52 AM, André van Deventer wrote:
>>>> Hi all
>>>> 
>>>> 
>>>> Firstly I know nothing about mac computers and do not have one.  I am
>>>> asking this on behalf of a friend who has one.
>>>> 
>>>> 
>>>> He bought a mac mini a few days ago.  Apparently there are two 3.5 mm
>>>> sockets on this machine.  One is an output and one an input. The output
>>> is
>>>> enough to drive a pair of headphones but the input seems to only be line
>>> in.
>>>> His question is whether it is possible to switch between line in and
>>>> microphone input like most windows sound devices.  Or is this socket
>>>> line in only?  He is trying to use a headset that he already has.  The
>>>> sound comes out fine on the output side but of course the input is
>>> completely dead.
>>>> 
>>>> Regards
>>>> 
>>>> 
>>>> André
>>>> 
>>> 
>>> 
>>> 
>>> 
>> 
>> 
> 
> 

**********
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