Hosco SOS-CG1 Sound Offset Spacer (SOS) for Classical Guitar

The Hosco SOS-CG1 is a Sound Offset Spacer (SOS) specifically designed for nylon-string classical guitars. This Japanese precision product is based on the MTS system (Minehara Tuning System, patent no. 4383272) and corrects the natural intonation problem that occurs when a string experiences extra tension when pressed, resulting in a slightly high-pitched sound despite correct fret placement.

By placing the SOS between the nut and the strings, the pitch between the nut and the 12th fret is noticeably improved. This is especially useful for open or dropped tunings, where tension differences are greater. The SOS is made of Bakelite – durable and stable – and easy to install without permanent modification to the instrument.

Specifications:

• Brand: Hosco (Japan)
• Model number: SOS-CG1
• Type: Sound Offset Spacer (SOS) for classical guitar
• Application: Intonation correction from the nut to the 12th fret
• Installation: Placed between the fingerboard and strings, directly next to the nut
• Material: Bakelite
• Suitable for: Classical guitars with nylon strings
• Based on: MTS theory (Minehara Tuning System)
• Advantages:
• Better tone clarity without adjusting the neck or frets
• Less need for tuning when using a capo
• Note: Improvement above the 12th fret requires bridge adjustment via adjustable saddles

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