The Barcus Berry Preamp/Tuner brings out the full lush & chiming sound of all 12-strings through any PA or amp. Specifications Body & Construction Top Wood Select Spruce (spalted maple on SM models) Back Wood Mahogany Sides Mahogany Type Acoustic Guitars Shape Dreadnought Electronics Preamp System Barcus Berry EQ4T Other Finish High Gloss Neck Neck Wood Mahogany Inlays Dots Hardware Hardware Chrome Tuners Die Cast.