Your guess is correct. The Macs have a line-in without a mic preamp. As 
posted by this person some time ago:

http://www.mac-forums.com/forums/215780-post5.html

most of the PC sound cards have a mic input with a preamp but the sound 
quality is poor. I guess Apple figured that anybody who wanted to do 
stuff with external mics would want to have good sound quality and would 
pick a preamp that they like. Condenser mics also need 48 v power 
(sometimes called phantom power) so just doing a line input removed a 
who lot of complexity that many users just wouldn't care about. That 
also means a bunch of junky PC mics just won't work with the Mac without 
some external gear. Most $30 and up preamps will sound pretty decent and 
have lots of nice features. Here's one example just googling around:

http://www.zzounds.com/item--BEHMIC100

CB

Dane Trethowan wrote:
> Hi!
>
> Okay, just because the microphone worked with the Windows PC doesn't 
> mean its going to work with the Mac I'm afraid and if my hunch is 
> correct - that you're using a microphone which plugs into the 
> microphone jack of a PC and you're expecting it to work plugged into 
> the Line in jack of your Mac - then you're going to be a little 
> disappointed I think <smile>.
>
> I can't answer your garage Band question I'm afraid so let's deal with 
> Skype then.  The first thing you need to do is set the audio 
> preferences in Skype, these are independent o the System Preferences 
> for the Mac and are found by pressing command-, in Skype, go to the 
> Toolbar, interact with it and press vo-space on the "Audio" button. 
>  From here you select your input and output, make sure the input 
> reflects the microphone or whatever you're using.
>
> I bypassed a lot of this trouble by using a simple USB microphone, 
> Logitech sell one for about $40.00 which does an excellent job, its 
> the same as the one I use.  You may also like to consider a USB 
> headset though be a little careful here, some microphones on some 
> sound as though you have your finger stuck up your nose <smile>.
>
> One final thing, to determine what you sound like on Skype, make a 
> call to "Skype Test Call" which should be in your contacts table 
> somewhere, if you can't find it then go into the "View" menu and 
> select "Show offline contacts"
>
>
> On 22/08/2009, at 12:46 PM, John G. Heim wrote:
>
>>
>> I am trying to use skype on my mac mini. But the microphone doesn't 
>> work. I
>> know the microphone I am using works because I just made a skype call 
>> with
>> it on my Windows machine on Monday. I also tried connecting a stereo 
>> imput
>> line to the jack and recording something with Garage Band and that 
>> didn't
>> work either.
>>
>> I went into system preferences and found the imput tab. I turned the 
>> lin-in
>> volume up to 100%. Still no luck.
>>
>> Any ideas?
>>
>>
>>
>>
>
>
> ******************************
>
> Dane Trethowan
> From Melton Victoria Australia
> mailto:"grtd...@internode.on.net <mailto:grtd...@internode.on.net>
> Twitter: http://twitter.com/grtdane
> blog: http://www.grtdane.wordpress.com
> Phone United Kingdom
> 02032874641
> Phone Australia
> 0390058589
> Phone United States
> 8159261869
> Fax:
> +61 3 9743 7954x
> MSN grtd...@dane-trethowan.net <mailto:grtd...@dane-trethowan.net>
> skype:grtdane12
>
> ******************************
>
>
>
>
>
>
> >

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