Dean Markley Acoustic Soundhole Pickup: The ProMag Grand

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Dean Markley Pro Mag Grand Acoustic Guitar Pickup
Dean Markley Pro Mag Grand Acoustic Guitar Pickup

Finding the right acoustic guitar amplification for instruments without on board electronics is easier said than done. The Dean Markley ProMag Grand, a humbucking magnetic soundhole pickup, can provide a quick and uncomplicated option.

The ProMag Grand is Easy To Install

Putting the ProMag Grand in place is a straightforward process, a convenient feature that makes this Dean Markley guitar product so appealing. The 4″x1-1/2″x1/2”pickup, with a polished ebony piano finish, sits inside a maple housing cover. Both ends have rounded edges filled with spongy foam cushioning designed to fit snugly against the guitar soundboard.

The back of the ProMag is covered in a thin layer of soft dark felt. No tools or special equipment are needed to complete the installation, allowing the surface of the guitar to remain free from potential damage. Dean Markely provides instructions and a plain diagram that can be accessed online prior to any purchase. The entire technique is a mere two-step procedure. These directions, clear-cut and concise, are simple to follow:

“1. Hold the guitar in normal playing position. Slide the pickup under the strings from the treble side, making sure the pickup is positioned so the cord comes out of the treble side, figure 1. (There is no need to loosen the strings.)”

Good Vibrations

When a guitar string is picked or plucked on an acoustic box, vibrations are produced that travel over the soundboard and into the chamber of the body where they are trapped and then forced out of the soundhole, precisely where the ProMag is positioned. A somewhat different process takes place in solid body electric axes.

Once in place, the pickup can be manually manipulated slightly closer or farther away from the strings, affecting the overall sound level accordingly. The ProMag converts vibrations and magnetism generated by metal strings, as well as the patented magnetic metal coils inside this Dean Markley humbucker, into electronic signals that travel through the attached guitar cable into an amplifier where it is transformed into sound.

Because the pickup converts energy from one form to another – the vibrations and magnetism into electric signals – technically it is considered a transducer.

Testing the ProMag Grand

The ProMag was tested on a Fender DG-11 dreadnought tuned to open G, DGDGBD, with action high enough for slide guitar and fitted with D’Addario acoustic EXP 16 coated phosphor bronze light strings. The slide used was a glass Dunlop 212, worn on the pinky. A Boss DS-1 distortion pedal run through a Marshall acoustic AS50R Soloist guitar amp with reverb and chorus did the rest.

When provoked, the Dean Markley set-up generated nasty, grungy, single string leads that growled with a heady, untamed character absent of hum noise. Overall, the pickup produced warmer midrange than bass, possibly a reflection on the guitar model and not the Dean Markley. Chords sounded slightly complex and bright.

The ProMag Grand carries a manufacturer’s suggested retail price of $129.95 on the Dean Markley website, but can found for around $50-$60 elsewhere.


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Paul Wolfle

As a vintage and contemporary music enthusiast, guitars dominate Paul’s life. He plays slide in open tunings on a National Steel Tricone resonator and electric blues, in standard tuning, on an assortment of other instruments including his white Fender Stratocaster.

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