Microphone Not Working On Line-In Port

Hi Im Trying To Get My Soonhua Mic I Just Got http://www.amazon.com/Professional-Condenser-Microphone-Laptop-Recording/dp/B00K 68MT9Q/ref=sr_1_1?s=electronics&ie=UTF8&… And I Dont Hear Any Audio Through The Mic And I Pluged My Headphones In The Headphone Port. One Thing I Noticed On Amazon Is That The Mic Had To Have A Amplified Port And I Dont Think I Have That On My Mac Mini. The Voltage Has To Be 1.5V idk Can Someone Help Me Because I Need It To Do Youtube Videos. I Used My Old Wireless Mic That Had A Base That Was Alredy Amplified That Worked. If You Could Help Thanks. 🙂