只修饰可数名词复数：a large/great /good number of；a good / great many /dozens /stores of ,quite a few
只修饰不可数名词：a great deal / a large amount of ,quite a little
可数和不可数名词均可修饰：plenty of ,a lot of ,lots of ,a large quantity of
audience 是不可数,所以应该是a large amount of audience才对