It sounds like you've got a couple crossed wires on terminology.
Sparges don't determine your final product volume- that comes from planning how much water you mash with, and then how much water you sparge with. You can hypothetically do any number of sparges. Say you want 6.5 gallons into the kettle (to boil off 1.25 gallons during the boil, ending with 5.25 into the fermenter and losing .25 to trub before bottling).
If you have 11 lbs. of grain at 1.25 qts./ lb. you will strike (your first addition of water to grain) with 3.4 gallons. The grain will absorb around 1.4 gallons, and you'll lose maybe a quart, depending on your system, to unrecoverable in the the tun. Let all this sit an hour, that's your mash step. Drain it off into the kettle, your gravity may be around 1.082- a lot of sugar dissolved into a little water, around 1.9 gallons.
Now it's sparge time (assuming batch sparging). Again you want 6.5 gallons, but already have 1.9 in the kettle. 6.5- 1.9= 4.6 gallons. You can single sparge that volume, or double sparge (2x2.3), or triple (1.5) or quadruple (1.15), though triple and quad are rediculous- I'm just making a point. So, heat whichever sparge volume you choose to ~180. Strike that to your wet grain, let it sit some amount of time. I use 20 minutes, others use 5, some folks go with >30. After that time, drain all this off. A single sparge may net 1.063 gravity. Repeat for additional sparges.
All you do with a sparge is to rinse residual sugar from the mash. Your grain starches have already been converted to sugar during the initial mash, you're just pulling more from them.
You should be at your boil volume now, so take another gravity reading. Commence boiling just like extract batches. Chill, pitch yeast, ferment, wait enjoy.
We're not doing anything with malt in the grains- the maltster did that for us, and that process simply starts the grain to sprouting, creating starches that we convert in our mash to sugar.
There's a lot of verbage to digest in this hobby and folks on the inside throw around the terms quite a bit- I got pretty twisted around when I started out, but following the links like TheZymurgist provided and reading the wiki
https://www.homebrewtalk.com/wiki/index.php/Category:Mashing will help. Kyle