Dual Action Truss Rod
A dual action (also known as two way or double expanding) truss rod is a more modern design and it is currently being used by some luthiers (notably Warmoth) in lieu of the vintage single truss rod. The dual action rod is installed in a straight channel in the wood as opposed to the curved channel used by vintage rods. When adjusted, it exerts force on the neck in both directions simultaneously, pushing towards the fretboard in the middle of the neck and away from the fretboard at the nut and heel.
A neck with a two way rod installed is often more stable and less influenced by climate changes. However, some players believe the dual action truss system has an adverse effect on the tone of the instrument, due to the weight of the second rod and the additional wood removal required for installation.
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