Sound Offset Spacer

S.O.S is designed to improve the intonation at each fret and is simple to install.

You only need to insert the S.O.S next to the nut between the fingerboard and the strings. It is designed and based on MTS theory (Patent no. 4383272) and made in Japan.

For electric guitars (nickel strings)
Fitting scale : 628-650mm

What is MTS theory?
MTS is an ultimate guitar tuning system based on the laws of physics. All fretted instruments have a fundamental issue. That is, when we press the strings at the fret, the string tension is increased and the tone will be a little bit sharp, even though the frets are set at the correct position. The inventor, Mr. Minehara researched and derived one formula to calculate the corrected (offset) value from string material, guitar scale, and string height.

Each Fret Pitch Will Be Improved With S.O.S.?e 
S.O.S. improves the pitch from the nut to th12th fret area. If you need to improve high fret area (over the 12th fret), you need to adjust the saddle.

Can I Change the String Gauge?
Yes. Even if changing the gauge with the same string material, the S.O.S. works well.

How Does Open or Down Tuning Impact?
Usually, as tensions decreases, the pitch gap increases. The S.O.S, under down-tuning, will still improve the pitch better than in normal conditions.

Using Capo, Do I Need Re-Tuning?
After setting S.O.S, each pitch will be improved already. So basically, no need to re-tune after setting the capo.