Martin OMJM John Mayer Signature Acoustic Guitar Utility Carts All the way up is

All the way up is full compression and the compression is reduced as you turn this counterclockwise which allows more of the boosted

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Deep & warm sound HIGH TENSION

maximizing the magnetic field for the highest output level

while the Mogaine is about 10 times LOWER

Martin OMJM John Mayer Signature Acoustic Guitar Utility Carts All the way up is*These are stock photos. For actual photos of the instrument, please contact us. In light of his ever expanding reputation and fan base, Martin collaborated with John Mayer on the creation of a second namesake guitar, one with many of the same attributes as his first OM 28JM Limited Edition, but one that would be more affordable and more widely available in the tradition of the popular Martin 000 28EC Eric Clapton model. This tasteful Orchestra Model