The Lo-TRS II (sometimes referred to as the Lo TRS 2) is a guitar tremolo bridge produced for Ibanez by Japanese firm Takeuchi. It is based on a design licensed from Floyd Rose.
The Lo-TRS II has saddles into which the strings are locked at the bridge. When paired with a locking nut it forms a double locking tremolo system. As its name implies, it employs a low-profile design which doesn't protrude as far from the top of the guitar as some other tremolos to minimize the interference with the player's hands. The ILT1 is a very similar bridge without the low profile.
The base of the Lo-TRS II is formed into two knife edges on either side which rest against posts secured to the guitar body forming a pivot. One of these knife edges is curved while the other is straight. Underneath a cast block bolted to the base secures a variable number of springs (typically three or four) the opposite end of which are connected to a claw. The claw can be adjusted in the rear cavity so that the tension of the springs is balanced by the tension of the guitar's strings. This balancing act allows the tremolo to float above the cavity routed into the guitar's top.
The Lo-TRS II has six independent saddles. After removing the ball ends, the strings are inserted into the saddle and secured with a clamp. Each saddle can be independently moved forward and back to set intonation of each string. The height of the entire bridge can be adjusted by raising or lowering the studs. There is no allowance to adjust the height of the saddles individually, but this can be accomplished, if necessary, by inserting shims under the saddle. The base and saddles are built to match a 400mm fretboard radius.
Parts and variations
The Lo-TRS II arm (part # 2CL2-1B) is attached by means of a threaded socket. This socket allows a tension adjustment so that the arm can swing freely or lock in one position. The ILT1 shares this same arm.
Several variants of the Lo-TRS II were produced. One version relied on independently mounted studs while another had studs which were integrated with a "hinge" plate, presumably for added stability. Each of these versions came in multiple finishes. Another version was made to fit left handed guitars. The final version was built to match the 250mm fretboard radius of the Joe Satriani signature JS100.
The Lo-TRS is essentially a less expensive version of the Lo-TRS. It was used almost exclusively for mid and lower priced guitars built in Korea.