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The S540QM is an S series solid body electric guitar model introduced by Ibanez in 1997. It was produced in Japan by FujiGen.
The S540QM features a quilted maple top and back on a mahogany body bolted to a maple neck with a 22-fret rosewood fingerboard with binding and abalone oval position markers. Components include a Lo-Pro Edge double locking tremolo bridge, a locking nut, Ibanez Quantum pickups with a pair of humbuckers flanking a single-coil and Gotoh tuning machines.
Similar models include the S540FM (flamed maple top), S540BM (burl mahogany top) and S540QS (quilted sapele top). The S540LTD is a related model without the exotic top and with sharktooth fretboard inlays.