No definitions found for 'upper frequencies'
Perhaps one of these:
upper paleolithic,
upper bench,
upper fruitland, nm,
upprop,
upper fruitland,
upriver,
upper berth,
upper peninsula,
upper avon river,
upper bound,
upper brookville, ny,
upper pharyngeals,
upper balcony,
upper falls,
upper avon,
upper volta,
upperville,
upper brookville,
upper black eddy,
upper providence township,
upper providence township, pa