Sitka Spruce is the most well-rounded tone wood and is used on more guitar tops than any other wood. This is due to the tonal qualities and sonic projection of spruce. It has a nice even tone and does not accentuate any frequency above another in an overpowering way. Spruce also has a strong attack and does not get muddy at high volumes. This makes it a very versatile wood and makes those players with soft touches sound great and people playing with other instruments cut through the mix.
The auditorium body shape is probably the newest body shape for acoustic guitars. The auditorium takes elements that players love from various other shapes and combines them into a single body. The sound will be slightly different than a dreadnought and will scoop some of the mid range but it maintains the full dreadnought sound. It has a skinnier waist, much like a grand concert. This allows the guitar to rest lower on a player's thigh when sitting down and does not put as much strain on the shoulder. It's not hard to see why auditoriums have gained popularity so quickly.
I keep getting blown away by Teton guitars! (This is my 3rd!!) Just received my STG105-TF (Twelve Fret). From a smaller body guitar, I expected a “thinner” sounding, “quieter” guitar. This guitar has plenty of bass and has twice the volume I was expecting! Nice warm tone and so easy to play. I bought this guitar more as a fingerpicker and, even though it has an 1-11/16″ nut, I personally find it very easy to fingerpick. I plugged this guitar into my Fishman Loud Box Artist acoustic amp and it sounded great! I have played some all solid wood guitars in the past that cost more than twice as much as my Teton that don’t sound as good as this one. BEST bang for your BUCK guitar out there!!! Thank you Teton Guitar!!!