SELECT MIN(watts) FROM table_name_37 WHERE class = "a" AND frequency = "91.5 fm" AND city_of_license = "elkhart, kansas"
Berapa banyak watt yang memiliki kelas A, dan frekuensi 91,5 fm, dan kota lisensi Elkhart, Kansas?
CREATE TABLE table_name_37 (watts INTEGER, city_of_license VARCHAR, class VARCHAR, frequency VARCHAR)