A truss rod is a metal rod that runs inside the neck of a guitar. It is used to adjust the amount of relief in the neck, which is the slight curve that the neck has when viewed from the side. Relief is necessary for a guitar to play properly, as it allows the strings to vibrate without buzzing against the frets.
Ovation guitars have a unique design that uses a carbon fiber reinforced neck. This makes the neck very strong and stable, and it also eliminates the need for a traditional truss rod. Instead, Ovation guitars use a system called the "adjustable neck angle." This system allows the angle of the neck to be adjusted, which changes the amount of relief in the neck.
The adjustable neck angle system is very easy to use. Simply loosen the two screws that hold the neck in place, and then turn the adjustment screw until you achieve the desired amount of relief. Once you have made the adjustment, tighten the screws to hold the neck in place.
The adjustable neck angle system is a great feature of Ovation guitars. It makes it easy to adjust the action of the guitar, and it also allows you to change the neck angle to suit your own playing style.