Types of Acoustic Guitar Pickups Explained (Buyer's Guide)

The Four Types at a Glance

Acoustic guitar pickups fall into four categories: under-saddle piezo, soundboard transducer, magnetic soundhole pickup, and internal microphone. Each category has strengths and trade-offs, and many modern high-end pickup systems combine two types into a single dual-source unit. Popular models include the LR Baggs Anthem ($299, piezo + internal mic), the Fishman Matrix Infinity VT ($169, piezo only), the K&K Pure Mini ($99, soundboard transducer), and the LR Baggs M1 Active ($229, magnetic soundhole).

The right pickup depends on your playing style, the guitar body shape, and how you plan to use the amplified signal. A bluegrass flatpicker needs different characteristics than a fingerstyle player, and both need different characteristics than a singer-songwriter strumming rhythm. I have installed hundreds of acoustic pickups at the Strum Avenue bench, and the most common mistake is picking a pickup based on price rather than playing style.

Under-Saddle Piezo Pickups

Under-saddle piezo pickups are thin strips installed under the bridge saddle. When the strings vibrate, they compress the piezo crystal, which generates a small electrical signal. This is the most common pickup type on factory-electronic acoustic guitars because it is cheap, reliable, and resists feedback well. Nearly every mid-range acoustic with electronics ships with a piezo like the Fishman Presys or LR Baggs Element.

The trade-off is tone. Under-saddle piezos have a characteristic midrange peak around 2-4 kHz that produces the quack sound acoustic players complain about. EQ correction with a good preamp (LR Baggs Venue DI, Fishman Aura Spectrum DI) can reduce the quack, but the underlying character never fully disappears. Piezos work best for players who value reliability and feedback resistance over natural tone, or for blended systems where the piezo provides the attack and a second pickup provides body.

Soundboard Transducer Pickups

Soundboard transducers (SBTs) are small contact microphones glued directly to the underside of the guitar top. The most common is the K&K Pure Mini ($99), which uses three transducer heads glued in a triangular pattern under the bridge area. Because they capture vibration from the soundboard itself rather than from the strings directly, SBTs produce a fuller, more natural tone than under-saddle piezos.

The trade-off is feedback sensitivity and the lack of a built-in preamp. The K&K Pure Mini is a passive system that needs an external preamp (K&K Pure XLR, $169) for balanced output to a PA. The pickup also picks up body vibration from the player's hands, which can be desirable (more percussive) or undesirable (more handling noise). Fingerstyle players who play quieter coffeehouse venues tend to love the K&K; strummers in loud bands often find them problematic.

Magnetic Soundhole Pickups

Magnetic soundhole pickups clip into the soundhole and sense the vibration of the steel strings via a magnetic field, the same principle as an electric guitar pickup. Common models include the LR Baggs M1 Active ($229), Fishman Rare Earth ($189), and Seymour Duncan Woody ($129). These are the only no-install pickups on the list, you simply clip them in and plug the cable into your amp or PA.

Magnetic pickups produce a warmer, more electric-like tone because they miss the body resonance entirely. They also only work with steel strings (never classical), and they feed back less than mic-based systems. Some players find the tone too electric for acoustic music, while others specifically want that character. Magnetic pickups are popular for blues, folk, and singer-songwriter work where a slightly darker tone is desirable and quick installation matters.

Internal Microphones and Dual-Source Systems

Internal microphones capture the natural sound of the guitar from inside the body. Standalone internal mics are rare because they require careful EQ and aggressive feedback control. The more common implementation is a dual-source system like the LR Baggs Anthem ($299) or Fishman Ellipse Matrix Blend ($329), which combines an internal microphone with an under-saddle piezo.

Dual-source systems use the piezo for the attack and the high-frequency detail, and the internal microphone for the body and warmth. You can blend the two at a mixer knob mounted in the soundhole. Most studio and touring acoustic players use a dual-source system because the blended tone is closer to a miked guitar than any single pickup can achieve. The extra complexity and cost (plus the need for onboard battery power) are worth it for serious players.

Choosing the Right Pickup for Your Playing Style

For bluegrass flatpickers and fast lead players, go with a dual-source system like the LR Baggs Anthem or Fishman Aura Spectrum. The combination of piezo attack and microphone body gives you the projection and detail needed for fast picking without losing tone quality. Budget: $299-499 installed.

For fingerstyle players and classical-style musicians, a soundboard transducer like the K&K Pure Mini gives you the most natural tone at the lowest cost. The passive operation means no batteries to worry about, and the tone closely matches how the guitar actually sounds under your ear. Budget: $99-249 installed with preamp.

For singer-songwriters playing loud band mixes, a magnetic soundhole pickup like the LR Baggs M1 Active or Fishman Rare Earth gives you feedback resistance and a forgiving tone that cuts through a dense mix. Budget: $189-299 with no installation needed.

For guitars with under-saddle systems you already own, consider adding a Fishman Aura Spectrum DI ($349) rather than replacing the pickup. The Aura uses digital impulse responses of well-miked guitars to re-shape your existing piezo signal into something much closer to a studio-miked sound.