The S540QS is an S series solid body electric guitar model introduced by Ibanez in 1998.
The S540QS features a mahogany body with a quilted sapele top bolted to a maple neck with a 22-fret rosewood fretboard with oval position markers. Components include a low-profile double locking tremolo bridge, a locking nut and Ibanez Quantum pickups.
The S540FM is a similar model with a flamed maple top. The S540LTD is another similar model without the exotic top and with sharktooth fretboard inlays.