Syntax for LARGE with criteria using OR

Hi,
I have column M with security type and column N with percentages. My goal is to get the largest, second-largest, etc. percentage if the security type is Equity or Fixed. I tried a lot of variations but cannot get it to work. Here's one of the things I tried:

=LARGE(IF($M$30:$M$500=OR("Equity","Fixed")),$N$30:$N$500),1)

Any help would be appreciated.
Thanks,
Phillycheese