Piezo 1way Pickup System (System55T) Solid Spruce Top Nato Back & Sides Nato Neck The FJX is Yamaha's most recent series. The medium jumbo bodied guitars deliver a sound with a well-defined bass, wide dynamic range, plus clear and excellent response. The FJX730SC and 720SC have both inherited quality features from our L Series like non-scalloped X bracing and a reverse L block neck attachment. The FJX730SC features an A.R.T. 1-way pickup system (System56) that faithfully reproduces the dynamic sound produced by its medium jumbo body. Onboard electronics include a chromatic auto tuner and 3-band equalizer.