These are high quality acoustic guitars with tops made from pieces of the body of select spruce and flamed maple back. These Electric Acoustic Guitar are designed to provide superior playability for theater, with a wide body that produces a dynamic sound, a Verstrebungsdesign, which is resistant to feedback, and an insert that provides access to the upper neck. The CPX900 is like the Yamaha APX900 with ART (Acoustic Resonance Transducer) pickup system fitted, which has two additional pick-up side for the control of tone and resonance are used.