heartless wrote:approximately is the key word here...
The "recommendation" is just that, a recommended starting point. You can take 5 printers of the exact same model, and no two will be exactly the same when they are dialed in to their optimum performance.
+1v 
I have 3 SD2s and two units had the same boards. Sangs and RUMBAs. Each time they were dialed different. The only time I check the voltages is if I think the driver died or some crazy thing like that. I always tune by ear, then by performance for fine tuning.
Just get it in the ballpark then spend 20mins or so tweaking it.
Printit Mason and Printit Horizon printers
Multiple SD2s- Bulldog XL, E3D v5/v6/Lite6, Volcano, Hobb Goblin, Titan, .9 motor, Lawsy carriages, direct Y drive, fishing line...the list goes on
Filawinder and Filastruder #1870.....worth every penny!