Okay, after looking at this for awhile it seems I was making two mistakes.:
The lib directory for irrKlang is divided in two, so instead of adding (IRRKLANGDIRECTORY)\lib to my library directories, I should have been using (IRRKLANGDIRECTORY)\lib\Win32-visualStudio.
Including the lib directory wasn't sufficient, I also needed to specify the use of the irrklang library file at the top of my class (#pragma comment(lib, "irrklang.lib")).
The lib directory for irrKlang is divided in two, so instead of adding
(IRRKLANGDIRECTORY)\lib
to my library directories, I should have been using(IRRKLANGDIRECTORY)\lib\Win32-visualStudio
.Including the lib directory wasn't sufficient, I also needed to specify the use of the irrklang library file at the top of my class
#pragma comment(lib, "irrklang.lib")
.