Preheat the oven to 325 degrees. Grease and flour a tube pan (See notes)
In a medium bowl whisk the cake flour, baking powder and salt to combine, set aside for later
Add the butter to the bowl of your mixer and mix until smooth. Gradually add the white and brown sugar and mix 3 to 5 minutes or until the mixture has lightened in color and is fluffy.
Add the eggs one at a time mixing, mixing after each until the yellow of the yolk is blended.
In a medium sized bowl or measuring cup, combine the maple syrup, buttermilk, maple extract, and vanilla extract. Set aside.
With the mixer on low speed, add the flour mixture alternately with the buttermilk mixture to the mixture of butter, sugar and eggs. Begin and end with the dry ingredients. We like to do three additions of dry and two additions of wet. Mix just until incorporated.
Pour or scoop the maple pound cake batter into the prepared tube pan or bundt pan. This cake recipe makes about 8.5 cups of batter. We used a tube pan with 12 cups baking capacity. If using a smaller bundt pan or tube pan, make sure that you have a least 1 ¼ inch from the top of the batter to the top edge of the pan. (Don't fill pan more than ¾ full).
Bake at 325 degrees for 1 hour and 5 minutes. Check your cake at about 50 minutes using a long wooden skewer or a toothpick to determine doneness. Bake until the toothpick comes out clean or with just a few crumbs attached.
Allow to cool in the pan on a wire rack for 10 minutes before turning out.
Allow the cake to cool before adding the caramel icing.