Engelmann spruce comes from Rocky mountains or mainly from Canada. It's softer, slightly weaker and more sensitive to rough handling than Sitka spruce but it is still very excellent choice for topwood. Engelmann top is usually fast responsing and sensitive, clesr and bright sounding with less warmth compared to Sitka. Differences are not very dramatical, anyway. Both Sitka spruce and Engelann spruce can be a topwood choice for a master guitar. Engelmann top is very light coloured, almost white.