Just my 2cents. I own a computer controlled kiln that will go to 2300 deg F - they run about $1700 not including $300 for the custom computer controller - see attached photo. You really can't use that for melting brass I don't think. For one thing, although I've never tried it, if you tried to put a flask with brass inside the kiln you might have to wait forever because the total continuous heat loss of the kiln will not allow the kiln to fire the flask up to POURING temperature, which must be considerably above the melting point, like 200 or 300 deg above melting temp. Even if it did melt it, if the brass melts above the mold and dribbles in you haven't cleared off any dross at that point and it will go right into the pour with inclusions in the finished piece. But it will never get there I'm pretty sure. It just can't melt it.
Let me point out that there are some great books and resources on building furnaces to melt brass and bronze to name a few:
http://www.artfulbodgermetalcasting.com/7.html
I think this may be the best furnace:
“The Artful Bodger’s Iron Casting Waste Oil Furnace”. Title says iron, but think silicon bronze
Then there's
"Li'l Bertha, A Compact Electric Resistance Shop Furnace" -David J. Gingery * see my note below concerning this book
"Handbook of Lost Wax or Investment Casting" - James E. Sopcak
both at http://www.budgetcastingsupply.com/Books.php (I own most all the books located on that page.)
The there's
Building A Gas Fired Crucible Furnace - David Gingery
and-
“The Complete Handbook of Sand Casting” by C.W. Ammenon both on ebay or Amazon
I haven't had time to really get into casting but have accumulated some theoretical knowledge for backyard casting.
*about this book: I own a copy. But what you really need to read along with it is this website by Dan http://www.dansworkshop.com/2008/03/homebuilt-electric-melting-furnace-2/