![]() If internal, they tend to be "boomy", and need a lot of EQ to reduce excessive bass. Guitar mics- These can be mounted internally or externally. Having sophisticated EQ run by someone with a clue helps, too. Great for a solo coffeehouse with a vintage Martin, right out for a loud band with a cheap guitar. They respond to the vibration of *the body*, instead of the strings, which produces a "woody" tone. Soundboard transducers- These systems work like a piezo, but instead of under the saddle, they are attached to the underside of the top of the guitar. They do have that slightly edgy semi-electric sound, so if you are a real tonewood purist, it may not be your first choice. You can move one from one guitar to another literally in seconds. Thay are usually passive, but not always. The connector can hang out of the soundhole, or go to an endpin jack. They require no skill or special tools to install. They sound good in a cheap guitar, as they don't care that much about how the body resonates. ![]() Very feedback resistant, they can sound "warm". Magnetic pickups- Like the pickups in an electric guitar, they respond magnetically to string vibration. Some have a separate piezo element for each string, intended to improve balance between the strings. I prefer them for fingerstyle more than hard strumming. They are pretty feedback resistant, but can produce volume spikes when the strings are hit hard (piezo "quack"). It may require adjusting the saddle slot to fit the transducer.( Don't try to do this yourself.) They are usually active, and require a preamp with a battery mounted to the endpin jack or somewhere else in the body. This requires drilling a small hole under the saddle, and usually requires adjusting the saddle height to compensate. Undersaddle transducers (piezo type)- These are the most common type, and are mounted under the saddle. Some reproduce the sound of the guitar accurately, and some are more edgy, more like an electric guitar. Some pickup systems are more prone to feedback than others. The more important question is what pickup to install, and what you want it to sound like. An acoustic with a pickup installed by a factory and an acoustic with a pickup installed by a luthier are the same thing.
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