THE BASICS
There are two important factors that influence the tone of a guitar
The Wood and The Shape


The Wood
There are again two important areas that wood selection will play a role
First is the top peice of wood or the sound board, and also the back and sides

Top Wood - The Sound board
Many guitar builders place a large importance on the sound board they place on there guitar.
It is commonly believe that it is the most influencial when providing a tone.

Some good qualities to look for is a 'solid top', refering that the soundboard is a one solid peice of wood and not another board with a laminate top on it.

SPRUCE
Spuce is a very common soundboard.  It is well known for its well rounded tone and aging properties.  As Spruc is played more and more the tone will change for the better.  Engelmann Spruce (pictured) is used on many high quality guitars.

CEDAR
Cedar is an inexpensive alternative to Spruce.  Cedar has a good tone but more brilliant (higher) than the well rounded Spruce.  Cedar will age much quicker than Spruce as well.  For a great sounding guitar with out the cost of Spruce, Cedar is the best option.

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Back and Side Wood
The wood that is used to construct the back and sides does not play as important of a role on the tonal qualities of the guitar as the sound board does.  Because of this more of an aethetic influence can play a role in deciding what to use.

Here are some common back and side woods
ROSEWOOD
Rosewood is one of the most popular back and side woods.  Brazilian Rosewood is the most coveted of all becuase of it's rich lows, briliant highs, and piano like mid-ranges.  Due to Brizilian Rosewood being endangered East Indian Rosewood is now the choice back and sides.

MAHOGANY
Mahogany is an inexpensive alternative to Rosewood.  Mahogany has a brighter tone than Rosewood but many feel that the sacrifice is well worth the price.  Mahogany is sometimes chosen becuase of it's "woodier" appereance when compared to Rosewood.

The Shape

Most guitars have two wider portions and a narrow area inbetween.  The narrow area was added so the guitar could comfortably sit upon your knee.

The wider portion at the bottom of the guitar is reffered to as the lower bout.  The lower bout plays a role in determining the lower tones.  The wider portion close to the neck of the guitar is the higher bout.  This plays a role in determining the higher tones. 

For many it is the aesthetic qualities of the lower and upper bouts, not the tonal differences, that will influence a guitaris to purchase an instrument.






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