Graph Tech Ratio Machine Heads – Ultimate Control & Precision
Ratio for bass machine heads is a tuning system that increases the predictability and efficiency by taking the guess work out of tuning. On conventional bass machine heads, each strings' machine head has the same gear ration; however, each string has a unique string diameter, causing each of the strings to react differently to the turn of the machine head. With Ration for bass, each string has its own specific gear ratio, so that every string reacts to the same turn of a machine head.
RATIO® patented gear technology
RATIO® - Calibrated Machine Heads incorporate different string gauges into the tuning equation.
From Low B to G - 76:1, 48:1, 36:1, 25:1, and 23:1.
We balanced the gear ratios to each string simplifying the tuning process.
With RATIO®, a half-turn is a semi-tone!
Every string reacts the same to any tuning adjustment. Predictable, precise tuning, on every string.
The PRB-5411 is a right-handed set of RATIO® Calibrated Machine Heads for BASS that use a 4 x 1 configuration.
In order to achieve higher gear ratios, Ratio are the world's first machine heads using a double envelope gear design with a hardened steel gear. Amazingly smooth and super strong.
