Spruce has characteristics that make it ideal for the "top" of an acoustic guitar (the part with the sound hole and bridge). Spruce is a straight-grained wood, and is very strong for its weight. In fact, Spruce was the wood used in early 1900s aircraft because it was very strong, yet still very light. For a guitar, this means a thin sheet of Spruce can be strong, yet easily transmit the resonance of the strings. It's this top-wood resonance that contributes the most to the sound character of a guitar. Three types of Spruce are used for Voyage-Air guitars: Select Spruce, Solid Spruce, and Sitka Spruce. All three make for a great-sounding instrument, and all have various considerations in terms of price, durability and performance.
Select Spruce is an engineered, high-technology laminate that uses thin layers of Spruce, bonded under heat and pressure. Because of the lamination process, Select Spruce is more flexible than a solid, single layer of Spruce. It is also more temperature resistant, and it holds up better to the occasional 'dings' and 'bangs' that occur when traveling with a guitar. For a travel guitar, Select Spruce is strong, inexpensive, durable and sounds really good. Select Spruce is used in the Voyage-Air Transit series guitars.
Solid Spruce is just what its name implies: it's a thin sheet of solid-wood Spruce that is used for the top of the guitar. As one thin sheet of solid wood, it has great resonance, tone, projection and harmonics. Realize that the family of Spruce trees covers a great many species. The Solid Spruce used by Voyage-Air guitar comes from the northern latitudes, where the wet and cold climate is ideal for the straight-grained Spruce that makes guitars sound great. Solid Spruce is used in the Voyage-Air Songwriter-04 series guitars.
Sitka Spruce is a particular species of Spruce that grows in the coastal rainforests of Alaska and Canada. It is widely known as an excellent tone wood for the top of an acoustic guitar. Sitka Spruce is commonly used on guitars where ultimate tone is the prime consideration, and price is no object. As used on Voyage-Air guitars, Sitka Spruce is a solid wood, very thin, that results in great projection, resonance and harmonics. This Solid Sitka Spruce is used for the Voyage-Air Songwriter-06 guitars, and for all of the Premier Series guitars.