Published at Friday, August 31st, 2018 - 22:15:49 PM. . By Aurelia Beaty.
Without going into too much technical detail, the Piezo differs from a traditional magnetic pickup in that the Piezo element vibrates with the string, sending an electrical signal of that vibration to a preamp within the guitar for processing, rather than capturing an electromagnetic representation of that vibration which can then be sent directly to an amplifier, or to an onboard preamp if further shaping of the signal is desired. The Piezo eliminates the need for steel strings, which would otherwise interact with the magnetic pickup, and also produces more satisfactory results for players with a lighter fingerstyle technique. Lest you think this is just another passing fancy, Parker has produced a nylon string version of their famous "Fly" model and another up-and-comer, Sadowski Guitars, is producing a Telecaster style model employing the same technology.
Because the strings of a guitar are close together, and the pickups use magnetic vibrations, there is a natural tendency for these magnetic pickups to detect and pickup electromagnetic signals from other nearby sources - anything from nearby microphones, to other electric equipment in the area - even lighting. This extra noise is generally not overly distracting, but does tend to create a kind of background hum. Single coil pickups tend to create the most amount of background hum, and the fact that most electric guitars tend to be incorrectly shielded against any interference of this kind, this can be quite unwanted.
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